1904.] NATURAL SCIENCES OF PHILADELPHIA. 157
SABELLID5: AND SERPULIDJE FROM JAPAN, WITH DESCRIPTIONS OF NEW
SPECIES OF SPIRORBIS.
BY J. PERCY MOORE and KATHARINE J. BUSCH.
In these Proceedings for 1903 was published a paper describing
most of the Polychseta taken in Japanese waters and elsewhere in the
North Pacific in the spring of 1900 by the U. S. F. C. steamer Albatross.
The present paper is a continuation of that contribution, and is based
on the same collections. A third part will some time deal Avith a num-
ber of species belonging to various families, the descriptions of which
are withheld until some desirable comparisons can be made. Among
the species previously described a considerable admixture of circum-
boreal forms was found, most of them from the more northern stations.
That none such is found among the Sabellidee and Serpulidse probably
results from the fact that all of the species described in this paper came
from the southeastern coast of Honshu, and especially from Station
3,707, on a sandy and gravelly bottom in Suruga Bay. Saint-Joseph's
revision of these families was largely used as a guide in the generic
references, but even with this help much difficulty was found in satis-
factorily placing several of the species, and it will be noticed that some
of them, and particularly Sabella japoiiica and Pomatoceras aurituhis,
depart widely from the generic types in some respects. In the enu-
meration of segments the collar setse have been counted as belonging
to the first of peristomial somite.
I take this opportunity to state that Maldane coronata and Axiothea
campanulata of my former paper are synonyms respectively of M.
gotoi and Cbjmene harai Izuka. Although Izuka's paper was pub-
lished some months before mine it was not seen by me luitil after
the correction of the final proofs.
Sabella japonica n. sp. (PI. XI, fig.s. l, 2; PL XII, figs. 39, 40.)
Without the branchiie the type specimen has a length of 25 mm.,
of which the thorax takes 5 mm., and is 2.5 mm. in diameter; the de-
tached branchia? are 7.5 mm. long. A second specimen without bran-
chiae is 23 mm. long. As the branchiae are detached some doubt
attaches to them. They are much twisted, with 15 pairs of rather
short, thick radioles slightly coiled inward at the ends; the barbs are
158 PROCEEDINGS OF THE ACADEMY OF [Jan.,
double-ranked, veiy close together, and have a nearly uniform length
of 1.3 mm. to the end of the radioles. No eyes are visible. The second
radiole from the dorsum of the right side terminates in a membranous
vesicle which is probably pathological, but which would act much like
the operculum of Apomatus. The branchial lobes are slightly involute
ventrally. The collar is stiff and erect, separated by the entire width
of the body dorsally, but prolonged ventrally as a pair of abrupt promi-
nent narrow lobes in contact at the base. Except for very slight
lateral emarginations the margin is entire. The thoracic region is
nearly terete, the abdominal somewhat depressed and of a uniform
width except at the tapering caudal end. There are 8 setigerous
thoracic and 55 or 56 abdominal somites, mostly distinctly marked
and uniannulate. Thick and very distinct ventral plates occupy the
neural third of the boch^ Those of the thorax are tmce as wide as
long and undivided, except the first, or peristomial one, which is as wide
as long and of a sugar-loaf shaped outline. The first abdominal ])late
is pentagonal, the others are divided into two equal squares by the
fffical groove which is very distinct ventrally, but, after turning to the
right in the fiu'row '^/ x, and bending forward on IX, disappears totally
on the side of the latter below the setse. There is no trace of the dorsal
groove. The setigerous and uncinigerous tori are strictlj' lateral and
not elevated above the general surface of the body; the latter diminish
in size caudally. The body cavity is filled with rather large eggs.
All of the setse (PI. XI, fig. 1) are of the winged capillary type, but
differ considerably in length, slenderness and width of the wing. They
are very nearly straight, ver}^ acute, and, although obliquely striated, the
wings have entire margins. Both avicular and pick-shaped micini
occur on the thoracic, the former only on abdominal somites. Their
number is alwa5^s small
—
e.g., 27 of each on III, 21 on VI, and 20 on
Vm, while never more than 18 of the avieukie only occur on abdominal
somites. In both regions they rapidly diminish in size from the end
of the tori nearest to the setae, the smallest in the abdominal tori
not exceeding ^ the size of the largest. In the thoracic region the
same statement applies to the pick-shaped hooks. The thoracic
avicular uncini (fig. 39) have elongated bodies, about eciualling the
elevated neck and head, the posterior process slender and produced,
and the breast small, but abrupt and strongly convex. The neck
meets the body nearty at a right angle, is high and erect, and curves
broadly and regularly into the stout tapering beak \\dthout any dis-
tinct enlargement into head or crest. The crest is represented by a
fine striation near the vertex without anv elevation or free teeth. The
1904.] NATURAL SCIENCES OF PHILADELPHIA. 159
sinus is very open with nearty straight parallel sides. On the abdomi-
nal somites these iincini (fig. 40) differ in the much reduced posterior
I^rocess, the deeper, more sloping breast and the more wedge-shaped
sinus. The figure is, however, somewhat foreshortened. The smaller
imcini (fig. 2) have a peculiar form, which is transitional between the
avicular and the usual pick-shaped uncini. The slender stem or body
is bent strongly and slightly thickened, but lacks a distinct breast.
The head is slightly enlarged with a very short, stout, slightly de-
curved beak and a prominent cap-like crest, much subdivided; from
the base of the beak projects a slender angulated filament. In the
form of the small uncini this species departs widely from the typical
Sabellce.
Suruga Bay, 3,707, 63-75 fms. Type and one other.
Potamilla acuminata n. sp. (PI. XI, figs. 3-6; PI. XII, fig. 41.)
This species is elongated and slender, a complete example having a
total length of 56 mm., of which the branchise are 20 mm. and the
thorax 5 mm., the diameter being 1.9 mm.
The branchiffi are more than ^ of the total length, and when retracted
into the tube are not at all or very slightly twisted and coiled. Two
specimens have 19 radioles on the right, 17 on the left, the other having
15 and 16 respectively. They are straight, slender, of nearly uniform
diameter, without eye-spots, and bear barbs nearly or quite to the tips
in the dorsalmost radioles, but have a free end devoid of barbs and of
considerable length in the ventral ones. Most of the radioles are pro-
vided with a short membranous wing on the inner side of the base, but
there is no trace of a connecting web. The barbs have the usual
biserial arrangement and equal or exceed the diameter of the body,
with little diminution toward the distal end. The bases are entirely
simple.
The collar is scarcely evident dorsall}', but becomes prominent
opposite to the dorsal setse line, just below which is a barely distinguish-
able fold. On each side of the median ventral line is a broadly roiuided,
flat, somewhat tliickened process, about as long as the first somite.
In the retracted specimens these overlap medially. The entire ventral
portion of the collar, except the ventral lobes, is extremely thin and
delicate.
Between the bases of the branchise is a small roimded prostomial
lobe, from which a broad folded memibrane extends laterally around
the mouth and joins the bases of the branchise. Connected with the
inner side of the latter also are the so-called tentacles, consisting of a
pair of processes about twice as long as the second somite, with the
160 PROCEEDINGS OF THE ACADEMY OF [Jan.,
leaf-like basal part folded longitudinally to form a groove, and the
terminal ^ attenuated.
The complete specimen has 8 setigerous thoracic and 68 abdominal
somites. The body is nearl}' terete throughout and has a nearly uni-
form diameter, except at the posterior end. Anteriorly the parapodia
are not at all elevated, but become rather prominent posteriorly.
Except the peristomeum all somites have sharply defined ventral
plates. In one specimen all, and in the others all but the first 8, are
divided into 2 equal squares by a ventral groove. The pygidium has
the form of a slightly oblique welt-like fold, which bounds the anus
dorsally and laterally. The fsecal groove is well-marked ventrally from
the anus to the somite IX, on which it passes caudad of the ventral plate
to the right and then bends sharply forward and passes obliquely
anterior to the seta bmidle to the dorsum, where it disappears.
All of the setae and uncini are of a pale glistening yellow color and
have the arrangement usual in the genus. The seta^ of II are all of
the winged capillary type, but differ in length, width of wing and degree
of curvature or bending. The more slender and regularly curved ones
are dorsal. The 7 succeeding thoracic somites bear both ca]>illary in
the dorsal and paddle-shaped setse in the ventral part of the bundles.
The former (fig. 3) have the characters just described, but the more
ventral ones exhibit transitions toward the broad form in the tendency
of the wing to widen and split into two divergent symmetrical plates.
The two kinds are, however, always distinct. The paddle-shaped
setse (fig. 5) are arranged in a short, close phalanx. They have rela-
tively stout, shghtly tapering, striated stems, with the short, broad
wings together forming a thin ovate expansion which tapers distall}'
into a mucronate tip, whose length equals the greatest Midth of the
blade and which is bent out of the plane of the latter. On the abdomi-
nal somites only capillary setae (fig. 4) again occur, and in graduallv
diminishing number. The more slender, elongated, nearly wingless
ones are usually paired with shorter broader ones.
On the thoracic segments the uncinigerous tori are flush with the
surface of the body and bear the two kinds of uncini in parallel vertical
rows, the aviculae being anterior. On somite III there are 44 of each,
on VI 32, and a further reduced number on VIII. The avicular uncini
(fig. 41) have the slender posterior process aiid the erect portion equal
and meeting at a right angle; the breast nearly hemispherical; the
neck erect and straight; the beak moderately long, acute and straight.
and inclined sharply downward with the lower margin ])arallel to the
breast; the crest elevated and much subdivided, with about .5 distinct
3904.] NATURAL SCIENCES OF PHILADELPHIA. 161
teeth along the profile. The pick-shaped imcini (fig. 6) are more char-
acteristic. They have slender, slightly curved stems, shghtly increasing
in diameter toward the distal end, and exceed the total length of the
avicular uncini. The head is small, with a rounded back, and a short
blunt beak, enclosed in a delicate and transparent hood, the base of
which is often inflated, and the distal part prolonged at right angles
to the stem into an exceedingly delicate and attenuated process, which,
though varying considerably in length, always much exceeds the length
of the head of the avicular uncini. The latter only occur on the ab-
domidal somites, where they form short vertical series of from 12 to 18.
Except that the upper outline of the breast is more sloping, they have
exactly the form of the thoracic ones.
In the form of its setse this species closely resembles Sahella {Pota-
milla?) assimilis Mcintosh, but the pick-shaped uncini of that species
have not been described. It was dredged by the Challenger in 600
fathoms off Buenos Ayres. It also agrees fairly well with the Pota-
milla torelli of Marenzeller and Langerhans, but not with JMalmgren's
original description.
The tube is circular and tortuous, of a tough cartilaginous consistency,
covered evenly with very fine sand and has a clear line, evidently of
attachment, along one side.
Sagami Bay, 3,698, 153 fms., 2 specimens and fragments of a third,
with tubes.
Hypsicomus lyra n. sp. (PI. XI, figs. 7-13; PI. XII, fig. 42.)
The type is very long and slender, having a total length of 84 mm.,
the thorax 6 mm. and the gills 20 mm. ; the diameter is 1.6 mm.
As seems to be usual in the genus, the basal lobes of the gills are
quite prominent, about equalhng the length of the first 3 somites,
and their somewhat membranous dorsal and ventral margins overlap
in the middle line. The distal end is strietl}^ transverse and even, so
that the radioles all arise from the same level. The radioles are long,
slender, straight, not winged, and united by a web for the basal |.
The double-ranked barbs are very numerous, slender and long, their
length about equalhng the diameter of the bod}^, l^ut diminishing some-
what before the short, naked tip of the radiole is reached. A con-
spicuous zone of reddish-brown eye-spots occupies about the third
-^-^
of the branchiae, though they exhibit much irregularity in arrangement,
and seldom occupy this entire distance on individual radioles. Each
radiole bears a series on each outer luargin, but the number varies from
5 to 20 or more, and they may be widely separated, jnuch crowded or
11
162 PROCEEDINGS OF THE ACADEMY OF [Jan.,
even coalesced. They also vary much in size, and the two series on a
radiole are seldom symmetrical.
The collar is simple, cleft, but in contact and slightly inturned dorso-
medially. The dorsal half is low, of an even height, and has a shghtly
wavy margin. The ventral half rises very gradually to the apex of
the triangular lobes which nearly meet in the middle line l^ut diverge
distally. There are no lateral incisions.
A pair of prominent tentacles are united with the middle of the inner
face of the undivided base of the palpi. They rise freeh' to a length
exceeding that base, and consist of a foliaceous proximal ^, and a nar-
row ligulate distal |. Besides these a pair of minute processes occur
side by side on the middle of the head disk, and probably represent the
true prostomial tentacles.
The 174 to 184 somites, of which S are thoracic, form a slender, elon-
gated body, terete anteriorly, but very strongly arched above and with
a sole-like ridge formed by the ventral plates in the posterior part.
The lozenge-shaped anus is situated in a small pygidium. In the
thoracic region the segments are longer and distinct ; in the abdominal
they are very short and posteriorly much crowded. Here the body
walls are very thin and distended by the w^ell-filled intestine. The
ventral plates of the thoracic region are not elevated above the general
surface, but occupy the entire area between the tori. Thej^ are sepa-
rated from each other l)y deep transverse grooves, and the first from
the peristomial collar by a deep brown or black, apparently chitinous
line. The first is about 4 times as broad as long, the second 3 times,
and the others not over 1^ times. The first al^dominal plate is about f
as long as the last thoracic, the second is polygonal, and the others
become successively shorter to the caudal end and form a deeply
pigmented, narrow, sole-like ridge, divided from the anterior margin
of the third one to the anus by the faecal groove. The facal groove
divides the ventral plates continuously to the posterior margin of
somite X, around which and IX it passes obliquely to the right, and
then along the middle of the dorsum of the thoracic segments, on Avhich,
however, it is very faint.
Dense tufts of setie occupy the dorsal portion of the setigerous tori
on II to VIII inclusive, and smaller tufts of very prominent setse pro-
ject from the ventral side of those of all abdominal somites. On
somite I are two setigerous lines shaped like the sides of a lyre, which
begin wdth a just perceptible curve slightly dorsad of the succeediiig
tuft of seta?, and diverge oljliquely forward in a nearly straight line to
the base of the collar, on which they extend as an intiu-ned loop of
1904.] NATURAL SCIENCES OF PHILADELPHIA. 163
very minute setse. The thoracic uncinigerous tori are strictly vertical,
and ventral to the setaj, and occupy an area on each side about equal
to the ventral plates. The abdominal tori are dorsal to the setse and
quite short.
On somite I the collar setse are arranged in a double series along each
line. Those of the dorsalmost series (fig. 8) are stouter, nearly straight,
and are terminated by an elongated conical hood or sheath more or
less inflated at the base, and usually bent or wavy in the slender distal
half. They are evidently intermediate in structure between the pick-
shaped uncini and limbate setse. Those of the ventralmost series (fig.
7) are more slender, sharply curved at the end, and provided on the
convex side with a short but broad obliquely striated wing. The re-
maining thoracic somites contain curved limbate setse in the dorsal
part of the fascicles and paddle-shaped spatulate setse ventrally. The
former (fig. 9) present no noteworthy features. The latter are arranged
in close double file, those of the cephalic file (fig. 10) being stouter with
,
very broad, truncate, usually more or less asymmetrical blades; those
of caudal (fig. 11) row have nearly circular blades, which usually bear
a smooth-edged mucronate tip as long as or slightly longer than the
blade. In the abdominal fascicles are 2 or 3 slender, nearly or quite
wingless capillary setse, and a small number of paddle-shaped setse (fig.
12), with small ovoid blades and a' prominent, stout, fringed terminal
process 2 or 3 times as long.
There are about 60 of each kind of uncini in the thoracic rows begin-
ning with II. The avicular form (fig. 42) has the base straight, much
prolonged posteriorly, and with a small rounded breast. From the
base the short, somewhat tapering neck inclines forward at an angle of
about 120°. There is no enlarged head, but the vertex is high, promi-
nent and narrow, with the rather short, straight conical beak bent
down at a sharp angle. The crest is scarcely difterentiated, the front
of the vertex being only faintly striated and not at all subdivided.
Pick-shaped uncini (fig. 13) are well differentiated and regularly paired
with the larger ones. They have straight, column-like stems, and
hollow sheath-like heads (sometimes slightly inflated), running
into slender, tapering processes nearly at right angles to the stem.
The abdominal uncini are fewer, smaller, and have longer necks than
the thoracic avicular uncini, but are otherwise c^mte similar.
The tube is slightly sinuous, nearly roimd in section and about
2.3 mm. in diameter. It has a peculiar tough horny texture, is thin-
walled and deep brown or almost black.
From H. phwatccnia (Schmarda) Marenzeller this species differs
164 PROCEEDINGS OF THE ACADEMY OF [Jan.,
especially in the presence of mucronate paleee in the thoracic tori and
in the greater number of setae and palese in the abdominal somites, as
well as in the form of the palea and pick-shaped uncini and the arrange-
ment of the eyes.
Sm-uga Bay, 3,707, 63-75 fms., 4 specimens, with tubes.
Dasychone japonica Mcintosh.
The specimens have a length of 40 mm., the branchiae being 13.
There are 8 setigerous thoracic and 76 abdominal somites and 28 to 30
branchial plumes. With the exception of occasional variations having
a second small accessory tooth, the uncini are exactly as figured by
Mcintosh. The tentacles are lanceolate, + the length of the branchiae
and thickly spotted ^\^th reddish-browm. Two specimens, one in a
membranous tube to which various foreign bodies are attached, from
an imknown station.
The first dorsal appendage of each branchial radiole is fully twice as
long as and much thicker than any of the others, and is single, and not
paired, as the others are. The collar begins dorsally as a prominent lobe,
which includes the first fascicle of setae; ventrally it is thickened and
the ventral lobes overlap medially for nearly their entire width.
There are no lateral incisions.
Laonome tridentata n. sp. (PI. XII, fig. 44.)
The type and only specimen is 44 mm. long without branchiae,
which are 9 mm. in length; the thorax is 7 mm. long and 4 mm.
diameter.
The detached branchiae found in the same bottle are not known
with absolute certainty to belong to this species. The basal part of
each palp forms an undivided plate about twice the length of the peris-
tomium and of a scroll-like form with a slightly spiral roll. Each
bears 15 rather thick short radioles not exceeding twice the diameter of
the thorax. The longest barbs or filaments at the base have a length
equaUing about ^ of the body diameter, and they diminish toward the
end, where the radiole terminates in a slender naked filament longer
than the longest barbs. There are no eyes.
The peristomial collar is about as long as the second somite, slightly
more produced on the ventral side and consequently somewhat oblique.
It is deeply cleft in the middle line dorsally and slightly so ventrally,
but without lateral incisions. It is thick and stift^, with the margin
entire and slightly produced, but not lobed ventrally.
There are 8 setigerous thoracic and 62 abdominal somites. The
body is slightly flattened, with a nearly uniform width, tapering some-
1904.] NATURAL SCIENCES OF PHILADELPHIA, 165
what toward the posterior end, where it terminates in a slightly oblique
pygidiiim with a somewhat ventral anus. The peristomium and the
base of the collar are dusky with numerous minute spots, which con-
tinue also on to the sides of several of the succeeding somites. No
distinct ventral plates are developed, but the entire body wall appears
to be somewhat glandularly thickened. Throughout the abdominal
region the fascal groove is very narrow but distinct. Reaching the
ventral middle line of IX it bends to the right and passes obliquely
across that segment to the level of the setffi, then in the furrowVIII/ IX
for a short distance, and obliquely across the dorsum of VIII to its
anterior border at the dorsal middle line, from which point it continues
forward, becoming very deep on II and I, and finally disappears in
the dorsal collar cleft.
The thoracic setigerous tubercles are quite prominent and the unci-
nigerous tori very long, the most anterior ones nearly meeting ventrally
and the posterior not much shorter. The abdominal tori are about
^
as long as the anterior thoracic.
The setas occur in strong tufts, but all are broken short off at the
body surface. A few fragments of the terminal parts indicate that
they are short and stout, with broad blades distinctly denticulated
on the margins. Both thoracic and abdominal somites bear rather
large uncini, all of one kind and arranged in a single series. A torus
on somite V contains 112, all of one size; on the abdominal somites
they are about f as large, and 41 were counted on somite XI.
They have the form (fig. 44) represented by Malmgren for the type
of the genus and quite unlike that figured by Marenzeller for his
Laonome japonica. The base is abruptly truncated posteriorly, nearly
continuing the direction of the posterior line of the neck, but is pro-
duced anteriorly into a remarkably prominent breast that reaches
beyond the tip of the beak. A short, thick, erect neck is surmoimted
by a scarcely enlarged head with a prominent, acute, slightly recurved
beak nearly parallel with the opposite border of the breast, from which
it is separated by a sinus much narrower than the diameter of the neck;
the elevated crest is composed of 3 or rarely of 4 very distinct, acute,
solid teeth of diminishing size.
Suruga Bay, 3,707, type only, without tube.
Euchone alicaudata n. sp. (PI. XI, figs. 14-16; PI. XII, fig. 43.)
The single example was taken from a tube and is regularly rounded
and of equal diameter, with the somites very indistinctly indicated, ex-
cept at the caudal end, where the body is flattened and tapers abruptly.
The total length is 38 mm., the thorax 6.5 mm., and the branchia 13
166 PROCEEDINGS OF THE ACADEMY OF [Jan.,
mm. There are eight setigerous thoracic and twenty-five abdominal
somites. The thoracic and most of the abdominal somites are ob-
scm-ely equally biannulate. Ventral i3lates are confined to the thoracic
segments and are divided into two equal parts by the transverse inter-
annular furrows. The last eight abdominal somites are more distinctly
differentiated, and decrease rapidly in diameter to the short rounded
pygidimn. From them the broad caudal membrane arises just ventrad
of the setffi, continuing anteriorly around the ventral surface nearly to
the middle hne, but posteriorly spreading widely as a horizontal plate
with a median emargination in which the pygidium lies. The basal
part of the membrane exhibits distinct metameric thickenings which
disappear toward the margins.
The anus is situated slightly ventrad in a small slit, from which the
very faint fsecal groove passes forward between the ventral cleft of
the caudal membrane to the posterior margin of somite IX, where
it turns to the left, passes obliquely across the side of this somite and
disappears in front of the setigerous area, but reappears in the dorsal
middle line of VIII and continues to the peristomium, where it turns
slightly to the left and disappears finally on the collar.
The collar is ver}^ peculiar. It is thin and rather high, its margin
even all around, but, owing to the obliquity of the peristomium due
to the prolongation forward of its ventral plate, the height of the collar
appears to be about twice as great dorsally as ventrally. The median
ventral part is injured so that the character of the ventral lobes cannot
be ascertained. Laterally at the level of the sides of the ventral plates
is an abrupt thinning, folded in the form of a little niche terminating
at the base in a minute pit; but there is no actual incision. Dorsally
a somewhat similar condition exists, each half of the collar being ad-
herent to the median line by a very delicate membranous fold, so that
no actual cleft is present, The fold of the right side overlaps the left
broadly, and thus deflects the end of the feecal groove toward the
latter side. No eyes nor otocysts are visible on either the peristomium
or pygidium.
As indicated by the measurements the branchice are relatively
elongated, contributing about ^ of the total length. The basal lobes
are exceedingly short and are entirel}^ concealed Avithin the collar.
There are 15 branchial radioles on each side, arranged strictly in one
row and of equal length. They show no tendency to coil or twist.
The radioles of each half are connected for ^ of their length by a delicate
membrane, to which they stand in the relation of the ribs to the cover
of an umbrella, and which is continued as a delicate wing, especially
1904.] NATURAL SCIENCES OF PHILADELPHIA. 167
wide on the most dorsal and ventral member of each group, along each
radiole and expands at their ends into a leaf-like appendage, through
which the naked end of the radiole passes like a mid-rib, and l^eyond
which it forms a short mucronatc tip. The filaments present the usual
paired arrangement and are numerous and exceedingly long, the length
of the basal ones being at least 1^ times the diameter of the thoracic
segments. Besides the ordinary filaments a number of very mucli
larger ones occur within the radioles, one apparently being attached
to the base of each of several of the latter. Though none is perfect,
they often equal ^ of the length of the radioles. As they bear slight
wings and have distinct cartilaginous axes, they probably represent
a second set of naked radioles. The region is so brittle that a thorough
study of the specimen is impossible. The tentacles are apparent!}'
short ovate-lanceolate in shape. Very small eggs completely fill the
body cavity.
The setse of the first thoracic fascicle and the abdominal somites are
apparently all slender, winged capillary, those on the latter with
extremely narrow wings. On the other thoracic somites there are
two forms; distinguished by the breadth of the wings and not always
to be sharply separated. Those in a dorsal group (fig. 14) have slender,
longitudinally striated shafts, more or less bent and drawn out to a very
fine tip, the winged margin fringed, confined to one side, of varying
width and reaching far out toward the end of the shaft. Those of a
ventral group (fig. 15) are shorter, stouter, with short, broad, usually
asymmetrical, obliquely striated double wings and an acuminate tip.
The internal structure is similar to the more slender setee.
The thoracic uncini (fig. 16), which are arranged in single rows, have
long, slender, curved stems with a slight shoulder at the surface of the
body and beyond it a neck; the head has a long, rather slender, slightly
recurved beak and a crest from which three larger spines are separated
on each side below, the rest being finely divided. The abdominal
uncini (fig. 43) are truncate behind, somewhat as in Laonome, but
with a slightly produced process ; the breast is both high and prominent
with a nearlj^ square anterior margin ; the sinus is very small ; and the
beak acute, surmounted by a crest exhibiting 6 or 7 teeth of diminishing
size along the profile.
The somewhat horny, stiff tube is covered with coarse sand grains
and minute bits of shell.
Sagami Bay, 3,698, 153 fms., type only.
168 PROCEEDINGS OF THE ACADEMY OF [Jan.,
Protula geniculata sp. nov. (PI. XI, figs. 17, IS; PI. XII, fig. 38.)
The tAvo specimens upon which this species is founded were taken
from the tubes, and are consequent!}^ in a rather poor state of preserva-
tion and altered in shape by the constraint. Except for the flattened
and tapering caudal end the form is completely terete and the thoracic
membrane is wrapped closely about the body. Following are the
measurements of the type : Total length, 27 mm. ; branchite, 5 mm.
;
thorax, 5.5 mm., and diameter of thorax, 1.2 mm.
Branchiae remain in the type specimen only, and are so fragile that
a complete study is impossible. Their bases are short and simple,
concealed by the collar ventrally but exposed dorsally. The radioles
number about 18 on each side, arise strictly in one row, although in
the retracted condition some of the dorsalmost ones are turned inward
and spirally twisted, so that they appear partly in a double row. Most
of the radioles are rounded in section, Init the dorsalmost one on each
side is flattened. There is no basal web. At the base of the radioles
the barbs are as long as one-half of the diameter of the thorax, but
become gradually shorter toward the tip, where they leave naked a
filamentous portion of the radiole about as long as the basal barbs.
There is no operculum.
The strictly ventral collar is produced directly forward to a length
about equal to an anterior thoracic somite ; the margin is smooth and
entirely without trace of any folds or incisions and with short rounded
lateral lobes. The thoracic membrane is rather prominent and pro-
duced anteriorly beyond the collar, but not overlapping its lateral
lobes. Dorsally the two sides overlap considerably in the middle line,
and are thrown into deep oblique folds at each somite, owing to the
stowing of a large surface within the small space of the tube. Posteri-
orly they reach beyond the last thoracic somite and join in a closely
appressed ventral fold covering the first abdominal somite below.
There are sev'en setigerous thoracic somites and seventy abdominal
somites. The bundles of thoracic seta are all at the same level and of
similar size; the uncinigerous tori are short, equal and widely separated
ventrally on all somites. The sides of the thoracic somites between
them are transversely wrinkled. On the abdominal region the anterior
tori are nearer the dorsal than the ventral side, but posteriorly they are
strictly lateral. At the posterior end the body is beveled toward the
dorsal side and is provided with low lateral ridges, but no distinct
caudal membrane. Dorsally this flattened region bears a narrow but
thick shield plate which tapers to an acute point anteriorly and is
partly metameric. It occupies about 20 somites and is white and
1904.] NATURAL SCIENCES OF PHILADELPHIA. 169
chalky in appearance. In another specimen this plate is less attenu-
ated anteriorly. The body throughout is much tinged with reddish-
orange which was probably the natural color.
All of the thoracic setre are of the limbate type with rather short nar-
rowh^ lanceolate ends, especially slender on those of the smaller collar
tuft; all are colorless, very slight!}^ curved and of more uniform size
than usual. The abdominal, except at the caudal end, bear two
geniculate setse (fig. 38) on each side. They are transparent and color-
less, with broad, short, A'ery thin and pointed blades, bent nearly at
right angles to the shaft, and which appear to have the margin per-
fectly smootli. On the caudal somites the sette occur in tufts of
three, but occasionally two; they are long, slender, capillary, tapering
and curved, but wingless at the tip.
The uncini are relatively small, very delicate, and much crowded,
with about 26 distinct and some smaller obscure teeth, all strongly
bent downward and overlapping. The upper part of the tooth-
bearing margin with the larger teeth rises prominently above the body
of the vmcinus. The thoracic micini (fig. 18) have the body quach'ate
with the truncate lower margin on a level with the elongated lower
tooth, while the abdominal uncini (fig. 17) have nearly triangular
bodies with the somewhat angulatcd margin not nearly reaching to
the end of the long tooth. This tooth is really a projection of the
body of the uncinus and itself bears a fringe of fine teeth on its basal
half.
Two nearly complete tubes are present in the collection. They were
evidently attached at the base only, with the greater part upright and
straight or slightly sinuous, gradually increasing in diameter, perfectly
terete, the walls thick, porcellaneous, with a thin, somewhat rough,
chalky surface marked with distinct lines of growth, but without any
ridges or other special sculpturing.
Suruga Bay, 3,707, 63-75 fms., 2 specimens.
Vermilia ctenophora n. sp. (PI. XII, figs. 21-25.)
A complete example has a total length of 27 mm., the operculum
6.5 mm., gills 5.7 mm., and thorax 5 mm. An incomplete specimen is
larger.
The branchife are considerably contracted and very compactly
packed into the tube, without any trace of a spiral twist. The undi-
vided base is relatively prominent, composing about ^ of the total length
of the gill. Wlien the branchiae are retracted the distal margin is
decidedly oblique and much longer ventrally. Radioles 20 on each
side, in the contracted state folded by the doublino- of the base dorsad
170 PROCEEDINGS OF THE ACADEMY OF [Jan.,
into an inner and an outer series, the barbs of wliich face each other.
The radioles are thick and short, with a short, thick, finger-hke termi-
nation lacking barbs, and in one specimen, not enclosed in a t\ibe, are
curled inward at the ends. There are no branchial eyes. Except near
the end, where they become shorter, the barbs have a length of about
f the diameter of the thorax and are numerous and crowded. Three
or four of the dorsalmost radioles each bear at the base a larger barb,
about 3 times as thick as the ordinary ones and somewhat longer.
Near the median line and at a somewhat more dorsal level is the pair
of tentacles of similar form but somewhat stouter. A membranous
fold encircles the base of the gills within and surrounds the mouth.
The last three features were clearly made out on the incomplete
specimen only, not on the type.
The operculum (figs. 21, 21a) is dorsal antl dextral. It has a slender,
wi'inkled, somewhat flattened stalk very slightly broader at the distal
end and without wings or membranous margins. The body of the
operculum is broadly egg-shaped, the basal f with soft non-chitinous
walls somewhat longitudinally folded, the distal f a smooth, bro\An
and firm chitinous dome with a narrow thickened double ring at the
base and the surface with traces of a rough calcareous incrustation.
In the type the stalk measures 4 mm. in length, .7 mm. in diameter,
and the body is 2.5 mm. long and 2 mm. thick. On the larger
specimen these measurements are respectively 4.5, .7, 2.5 and 2 mm.
On the type the collar and thoracic membrane are closely folded
about the body from contact with the tube, but evidently fully agree
with the following description, based on their expanded state in the
larger cotype. The collar is produced directly forward for a distance
of 1 mm. from the prostomium for the entire width of the space be-
tween the ventral margins of the setigerous tubercles. At the sides
short round lobes are produced, but there are no other processes and
no clefts. The thoracic membrane extends as a broad modulating
fold from the first to the fifth torus inclusive, overlapping its fellow
medially, the lateral margin of the collar anteriorly, and the sixth torus
caudally.
The first setigerous tubercle is included in the base of the thoracic
membrane; the others form, with the uncinigerous tori, freely project-
ing flaps which increase in size and prominence from the second cau-
dally, the last being especially large, nearly twice its predecessor, and
almost reaching the median line ventrally, while dorsally it partly
covers and conceals the, in this case, detached setae tuft. The body is
slightly flattened and tapers to the caudal end, where the nearly
1904.] NATURAL SCIENCES OF PHILADELPHIA. 171
terminal or slightly ventral anus occupies a notch. A thickened
dorsal shield plate, of a pink color and elongated elliptical form, occu-
pies about 26 somites. There are in all 7 setigerous thoracic and about
100 abdominal somites, though the number could not be 'accurately
determined, owing to an injury to the only complete specimen.
The thoracic setse present the same general features as in V. pluri-
annulata, but are throughout more slender, delicate and acute, and
have narrower wings; the number of nearly or quite wingless ones is
also greater. Throughout the greater part of the abdominal region
l3ut two setsB (fig. 23) occur in each bundle. These are delicate,
colorless and of the same type as in V. pluriannulata, but have
narrower, less angulated and less curved blades, which in the case of
one is almost perfectly straight.
The arrangement and form of the thoracic uncini (fig. 24) is also
A^ery close in the two species, the chief difference being that in this the
teeth are usually 15 in number and exhibit a more exact alignment
with the basal plate. Very often a minute tooth occurs on the basal
plate just below the large truncate tooth, and the overlapping of the
latter by the preceding tooth is often very marked. Abdominal
"uncini (fig. 25) differ still less, but the number of acute teeth is 11-13.
The caudal setae are all broken short off.
Only a small piece of the tube is present. It is thicker than that of
Vermilia pluriannulata, measures 3 mm. in diameter at the mouth,
which is broken, and 2.5 mm. at the opposite end. The single flange
present extends only halfway around the tube on the free side, but is
very prominent and flaring. The surface of the tube is marked by
rough transverse lines of growth with a slightly spiral turn, and on
the flange section onl}^ by 5 rough longitudinal ribs.
Suruga Bay, 3,707, 63-75 fms., 2 specimens with fragments of tubes.
Vermilia pluriannulata sp. nov. (PL XII, figs. 26-32, 45; PL XI, fig. 19.)
The single example from which this species is described measures:
Total length, 1 9 mm. ; branchiae, 4.5 mm. ; thorax, 3 mm., and diameter,
2.4 mm. The branchiae are in bad condition, but show 19 radioles on
each side, w^hich are shorter and have relatively longer and more slender
naked tips than in V. ctenophora.
The operculum is developed from the left dorsal branchial radiole,
and the stalk and body each measure 2.5 mm. long. The former is
of nearly uniform diameter, very slightly depressed and marked with
numerous transverse wrinkles, as though in contraction. The body
(figs. 26, 27, 28) is broadly elliptical in face views, but in profile shows
a nearly parabolic ventral and a slightly convex dorsal outline. It is
172 PROCEEDINGS OF THE ACADEMY OF [Jan.,
divided into two nearly equal halves, the proximal of which is soft and
longitudinally wTinkled, with a delicate ehitinous enclosing membrane,
the distal very firm and ehitinous, marked by 6 very narrow dark
ehitinous annular thickenings which have a slightly excentric arrange-
ment, as a result of which they are much crowded dorsally and more
widely separated ventrally, leaving a nearly circular, slightly excentric,
convex, pale-colored terminal disk. Probably the entire distal half,
with the exception of this disk, was originally covered with a calcareous
coat; rough fragments of such an incrustation remain especially
on the ventral surface.
The collar is higher and its lateral lobes more prolonged than in V.
ctenophora, but is otherwise similar. The thoracic membrane is also
similar, but much higher, fully equalling the dorsal distance between
the setae tufts. As in V. ctenophora its base ends at the fifth seta tuft,
but a free lobe projects much beyond this to the seventh.
There are 7 setigerous thoracic and about 110 abdominal somites,
the posterior ones very short and much crowded. For most of its
length the body is nearly terete, but at the posterior end is slightly de-
pressed and tapering. The extreme caudal end is slightly curved ven-
trad, so that the anus looks downward and is somewhat covered by the
posterior margin of the dorsal plate. The latter is much thickened and
of an ovate form, covering about 25 somites with the Inroad end tow^ard
the head.
The thoracic setse are numerous, except in the collar fascicle, and
form conspicuous pale yellow tufts. Those of the first fascicle are
mostly wingless or nearly so, the limbate ones being more slender
and with the wings narrower than usual in succeeding tufts. On the
succeeding thoracic somites the number of wingless setse is much re-
duced, and most of them (figs. 29 and 30) are stouter and distinctly
limbate on the convex side and, while differing considerably in length,
curvature and breadth of wing, they have the wings const antl}^ wider
and more dehcately striated than in V. ctenophora.
With the exception of those near the caudal end each abdominal
fascicle bears but three colorless setse (fig. 31) with slender stems and
rather broad but exceedingly thin and delicate blades. The ends are
tapering and curved, with a distinct angle at the base of the convex
side, which is fringed for f of its length. These setse are always stouter,
more angulated and less distinctly fringed than those of Vermilia
ctenophora, and the 3 exhibit a closer similarity of form and size. A
number (about 25) of the segments at the caudal end bear tufts of 4 or
5 long, slender, colorless capillary setse of a quite different form (fig. 45).
1904.] NATURAL SCIENCES OF PHILADELPHIA. . 173
They about equal or exceed the body diameter, are strongly directed
ventrad, and for the greater part of their length they are gently, and
near the tip more sharply, curved; and here are also flattened and
provided with a delicate wing, beyond which they taper to an acute
point.
The tori of somite III contain about 90 uncini and more posterior
thoracic somites a much greater number. They are rather large trape-
zoidal plates (fig. 32), coarsely striated transversely. The pecti-
nate margin bears 14 or occasionally 13 acute teeth, of which the 4th,
5th and 6th are the largest, the upper ones becoming shorter and the
lower or cephalic ones especially more slender, the former more hooked,
and the latter straighter but more imbricated and appressed, and the
last 2 or 3 successively wider, flatter and more curved in the trans-
verse plane. The last tooth is much larger, tubular and truncate, and
in man}^ cases is more or less closely embraced by the preceding one.
The anterior abdominal tori bear about 20, the caudal ones as many as
50 uncini (fig. 19), which are only about h as long and much more deli-
cate than the thoracic ones which they resemble closely in form.
The apical offset from the plate is more prominent, the number of teeth
usually 13 or sometimes 12, and the truncate tooth is more closely
embraced by the one next to it than in the thoracic uncini.
Fragments of the tube are 3.5 mm. in diameter at the mouth, 2 mm.
in diameter at a distance of 30mm. from the mouth. Externally they are
marked by a series of wide flaring flanges, sometimes completely encir-
cling the tube, sometimes coalescent with it or incomplete on one side.
The surface is marked by a varying number of delicate but rough,
undulating parallel longitudinal ridges about .7 mm. apart, the number
being usually limited to about 6, confined to one, but not always the
same, side. On the free flaring portions of the flanges these ridges
become broken into flat spines, many of which are arranged trans-
versely.
Suruga Bay, 3,713, 45 fms., type and portions of tube.
Pomatostegus latiscapus Marenzeller.
Two specimens of a Pomatostegus agree closely with Marenzeller's
description of all parts except perhaps the collar, concerning which it
is simply stated that it is produced directly forward and has no lateral
incisions. In the Albatross specimens the collar has a very irregular
and ragged border, with a long median ventral process and somewhat
smaller dorso-lateral processes at the level of the setse; but no actual
incisions. The setse and operculum agree perfectly. In one specimen
the operculum bears 4, in the other 7 platforms, and in the latter
174 PROCEEDINGS OF THE ACADEMY OF [Jan.,
is completely enveloped in a growth of sponge which forms a spherical
mass fitting the lumen of the tube.
Suruga Bay, 3.707, 63-75 fms.; 3.740, 65 fms.
Pomatoceros auritubis sp. nov. (PI. XII, figs. 33-37; PI. XI, fig. 20.)
This species is known only from a single specimen without tube which
measures IS.5 mm. in total length, of which the gills are 6 mm., the
operculum nearly 7 mm., and the very short thorax, without the collar,
2.5 mm. The branchiae have 26 radioles on each side, and each half
is rolled inward in a somewhat scroll-hke fashion clorsally and ven-
trally. The radioles are somewhat thick and are terminated by a short
filament free from barbs, the basal ones of which are about ^ the length
of the radioles, A tolerably well-developed web connects the basal f
of the radioles.
The operculum (figs. 33, 34, 35) is developed from the dorsalmost
left radiole. Its stalk is broad and flat with prominent lateral wings
extending its entire length and increasing in wddth to the distal end,
where they terminate in narrow, pointed processes embracing the sides
of the opercular body. The stalk is attached excentrically to the dor-
sal side of the body of the operculum, which is bent strongly ventrad.
The body is hemispherical with somewhat flaring margins, and bears
by a short thick stalk on its distal face a membranous circular concave
plate with broad, thin, flaring margins, and a low, slightly rounded
central eminence. There are no spines, but two slight marks may be
the scars of attachment of a pair. The free margins of the disk are
chitinoid, l^ut there is but little indication of calcareous infiltration,
the body of the operculum having about the consistency of a rather
soft cartilage.
The collar is high and prominent, about equalling the length of the
first two somites. Laterally it begins at the level of the first setse tufts
in a pair of lobes which are much overlapped by the dorsal membrane.
Its margin is much folded and serrated, finely on the dorsal, coarsely
on the ventral part, and in the median ventral region is produced for-
ward as a slender lanceolate lobe, but is nowhere deeply incised. The
thoracic membrane is low posteriorly, with a very delicate ventral fold,
but becomes high anteriorly wdth the dorso-anterior angle thrown
into a tuft of folds and overlapping the lateral collar lobes.
The anterior pair of thoracic setse tufts are widely separated from the
others, embedded in the thoracic membrane and project forward.
Succeeding setigerous and uncinigerous tori of the thoracic region are
at first placed at a high level, but sink lower and lower until on the
last thoracic somite the latter are entirelv on the ventral side aiid much
1904.] NATURAL SCIENCES OF PHILADELPHIA. 175
inclined forwarcV and inward. The last two especially have their
ventral ends entirely free, and those of the last meet in the middle line.
The ventral plates, which are included in the area between the tori,
consequently form a nearly equilateral triangle with the apex caudad.
All of the abdominal somites are short and crowded, especially poste-
riorly, and no caudal plate or membrane is developed. The anus is
terminal. No pigment remains in the specimen.
Somite I bears a compact slender tuft of pale, ghstening, lanceolate,
limbate setse. They differ considerably in length, width of wing and
curvature, but all have the margins very distinctly serrated. On the
other thoracic somites the setse are of the same form, but the wings
are generally shorter and broader, the bmidles less compact and more
spreading, and more distinctly arranged in tw^o rows, one of larger,
the other of smaller setse. Abdominal somites generally bear three
delicate colorless setae of the form shown in fig. 36. They are appa-
rently not trumpet-shaped, but spatulate, with one angle of the flat-
tened end prolonged obliquely into a conspicuous spine upon which
the dehcate teeth are continued. The stems are delicately longitudi-
nally striated. The posterior abdominal sette are all broken off.
The thoracic uncinigerous lines begin at the seta tufts and are rather
long, that of somite II containing a few more than 200 uncini, which
decrease in size toward the ventral end. Abdominal tori contain
little more than | as many. The uncini are delicate pectinate plates.
Those of the thoracic somites (fig. 37) have quadrate plates bearing
13-15 strongly decurved, very acute teeth; the lowermost scoop-tooth
is broad, opens toward the uncinial plate and projects freely beyond
the lower margin of the latter. Abdominal uncini (fig. 20) are about
•i as large and have only 11 or 12 acute teeth besides the scoop-like
one, and the plate is triangular, with its lowermost angle produced into
a process about j as long as the lowermost tooth.
Suruga Bay, 3,713, 45 fms., type only, without tube.
The Spirorbes in the collection w^ere submitted for study to Miss
Katharine J. Bush, of the Yale University Museum, who has kindly
furnished the following descriptions:
Spirorbis argutas Bush sp. nov.
Tube coiled in a low discoid sinistral form with large central cavity,
spreading around the base in a thin layer, the whorls radially enlarging
and ornamented by one large median keel which renders the surface
on each side slightly concave, all crossed by distinct transverse lines.
Smaller specimen about 1 mm. in diameter; larger^ about 1.5 mm.
176 PROCEEDINGS OF THE ACADEMY OF [Jan..
Fig. a. S. argutus, operculum
mounted in gh^cerine.
Branchiae too much matted to determine their number. Operculum
(fig. a) a thin transparent elongated membranous bulb, flat on top
and protected by a thin calcareous
disk slightly thickened in the center,
borne on a long, very slender pe-
duncle.
Thorax with three fascicles of setae
and two rows of uncini on each side.
All the setae simple tapered blades
(fig. b), so small and delicate as not
to be clearly seen under a 7 objec-
tive, showing no serrations on the
edge of the blade even under y"^ oil immersion. Uncini very narrow,
hnear, the teeth appearing as but slight roughnesses on the surface,
even under the highest power. Abdominal uncini in the first series
or segment not appreciably smaller than those on the thorax; setae
not found.
Two specimens on one of the red algae with the following (S. jo-ra-
minosus), at Station 3,730. in 34 fathoms, May 16, 1900.
Spirorbis foraminosus Bush sp. nov.
Tube coiled in a similar manner
to that of S. argutus, but in the op-
posite direction, and larger, with the
surface ornamented with three distinct
carinae, the middle one the most
prominent, the surface on each side,
or the interspaces, slightly concave
and punctured by minute holes or
foramina, apparently caused by the
erosion of the thin epidermal layer;
the immature forms probably having
the entire surface crossed by numer- Fig- b.
ous prominent transverse lines.
Branchiae, the number of which is not determined, are long and folded
about, partially covering or protecting the large operculum (figs, c
and d), which is in the form of an elongated (apparenth' stiffened b}-
a very thin deposit of Hme) cylinder-like broodpouch filled with eggs
;
the end protected by a calcareous disk with flaring edge and an inner
enlarged basal portion, showing the length of the ventral area attached
posteriorly to the secondary calcareous disk on the end of the opercu-
lum proper, which is formed of many longitudinal muscles spreading
S. argutus, seta from 3d
thoracic somite.
1904.] NATURAL SCIENCES OF PHILADELPHIA. 177
from a short peduncle, which is apparently differentiated from the
longitudinal ventral muscular layer of the body-wall and separated
from the branchial lobes.
Thoracic setae simple tapered blades with but little color in
three fascicles on each side with two series of uncini. Those on the
collar (fig. e) somewhat broader and less regularly tapered than the
others; no odd ones found in the second or third bundles. Uncini
distinctly yellow or delicate horn-color with numerous fine teeth,
clearly seen under a 7 objective, those on the abdomen much shorter
and associated with a single similarly colored seta.
Two specimens on one of the red algae with S. argutus, at Station
3,730, in 34 fathoms. May 16, 1900.
Figs, c and d. S. foraminosus, front and rear
views of operculum, filled with eggs.
Fig. c. S. foraminosus,
seta from collar fascicle.
Spirorbis bellulus Bush sp. nov.
Tube small, regularly coiled, dextral, with small central cavity, the
rounded whorls ornamented with three, sometimes four, unequal,
rounded threads, the one on the summit being more prominent than
the others.
Specimens from 1 to 1.5 mm. in diameter.
Branchiae peculiarly developed, probably abnormal, broad, thin,
flattened, with few pinnae. Operculum
(figs. / and g) on a very long peduncle,
with somewhat squarish calcareous plate
with deep erect thickened rim.
Setae (fig. h) long and slender simple
blades, similar in all the fascicles which
are three on each side of the thorax
with two series of uncini, those on the
collar showing a few comparatively
12
Figs. / and g. S. bellulus,
operculum, front and rear
views.
178 PROCEEDINGS OF THE ACADEMY OF [Jan.,
coarse serrations on edge, seen under a 7 objective, Uncini very
narrow, the teeth too fine to determine. Abdominal setse and uncini
not seen.
- Steamer Albatross, May 8, 1900, at Station
3,707, off the coast of Japan, in 63-75
fathoms. Five specimens on fragments of
mollusks and pebbles.
Spirorbis dorsatus Bush sp. nov.
Tube small, regularly coiled, dextral, dif-
fering from the preceding (S. bellulus) in
having but one very prominent keel on the
middle of the whorls, rendering the tube
three-sided. A small nematode worm and
sand filled the tube, but no animal was
found.
Three specimens were found with the pre-
ceding, at Station 3,707, in 63-75 fathoms.
As no animals were found, it is impossible to determine whether or
not these tubes may not be the young of S. foraminosus.
Fig. h. S. bellulus, seta
from collar fascicle.
Explanation of Plates XI and XIT.
Plate XI, Fig. 1.
—
Sabella japonica. Slender lanceolate seta from ventral part
of the fascicle of V, X 480.
Fig. 2.
—
Sabella japonica. Small imcinus from the dorsal part of the torus
of V, X 480.
Figs. 3-6.
—
Potamilla acuminata.
Fig. 3.—Slender seta from dorsal part of VI, X 335.
Fig. 4.—Face view of a slender seta from XL, X 335.
Fig. 5.—Two views of a spatulate and mucronate seta from ventral part
of VI, X 335.
Fig. 6.—A pick-shaped uncinus from VI, showing a slender tip of about
the average length, X 600.
Figs. 7-13.
—
Hypsicomus lyra.
Fig. 7.—Limbate seta from the ventral series of the collar fascicle, X 480.
Fig. 8.—Hooded seta from the dorsal series of the same, X 480.
Fig. 9.—Limbate seta from the dorsal part of V, X 335.
Fig. 10.—Plain paddle-shaped seta from the ventral part of V, X 335.
Fig. 11.—Mucronate paddle-shaped seta from the same, X 335.
Fig. 12.—Bilimbate pointed seta from a posterior abdominal somite, X 335.
Fig. 13.—Pick-shaped uncinus from VI, X 480.
Figs. 14, 15, 16.
—
Euchone alicaudata.
Fig. 14.—Outline of slender seta from the dorsal part of V, X 480.
Fig. 15.—One of the more symmetrical broadly bilimbate setse from the
ventral part of V, X 480.
Fig. 16.—A crochet from VI, X 480.
Fig. 17-18. Protula geniculata. Abdominal and thoracic uncini respec-
tively, X 800.
1904.] NATURAL SCIENCES OF PHILADELPHIA. 179
Fig. 19.
—
Vermilia pluriannulata. An abdominal uncinus, X 600.
Fig. 20. Pomatoceros auritubis. An uncinus from the middle abdominal
region, showing also the outlines of the front and back faces of the
large gouge-shaped tooth, X 600.
Plate XII, Figs. 21 to 25.
—
Vermilia ctenophora.
Figs. 21, 21a.—Dorsal and lateral views respectively of operculum, X S.
Fig. 22.—An average limbate seta from VI, X 250.
Fig. 23.—The smallest and most curved seta from an abdominal pair, X 440.
Fig. 24.—Uncinus from V, X 440.
Fig. 25.—An uncinus from the middle abdominal region, X 440.
Figs. 26 to 32.
—
Vermilia pluriannulata.
Figs. 26, 27, and 28.—Dorsal, ventral and lateral views respectively of the
operculum, X 13.
Figs. 29 and 30.—Long and short slender limbate setse from VI, X 250.
Fig. 31.—The middle seta of the three on somite XXX, X 440.
Fig. 32.—An uncinus from V, X 440.
Figs. 33 to 37.- Pomatoceros auritubis.
Figs. 33, 34, 35.—Dorsal, ventral and lateral views respectively of the oper-
culum, X 8.
Fig. 36.—Middle abdominal seta, X 440.
Fig. 37.—Uncinus from IV, X 440.
Fig. 38. Protula geniculata. Seta from middle abdominal region, X 250.
Fig. 39. Sabella japonica. Uncinus from dorsal part of VI, X 360.
Pig. 40. Sabella japonica. Uncinus from ventral portion of a middle ab-
dominal uncinus, X 250.
Fig. 41. Potamella acuminata. Uncinus from VI, X 360.
Fig. 42. Hypsicomus lyra. Uncinus from VI, X 360.
Fig. 43. Euchone alicaudata. Uncinus from XXI, X 360.
Fig. 44. Laonome tridentata. Uncinus from XVI, X 360.
Fig. 45. Vermilia pluriannulata. End of a capillary caudal seta represent-
ing about \ of the exposed part, X 250.
PROC. ACAD. NAT. SCI. PHILA. 1904. PLATE XI.
MOORE. SABELLID^e AND SERPULID.^.
PROC. ACAD. NAT. SCI. PHILA. 1904. PLATE XII.
MOORE. SABELLID.^ AND SERPULID^E.