DESCRIPTION OF A NEW SPECIES OF ANILOCRA FROMTHE ATLANTIC COAST OF NORTH AMERICA.
By Haeriet Richardson,
Collaborator, Division of Marine Invertebrates, U. S. National Museum.
Through the Biological Survey of the U. S. Department of Agricul-ture, three specimens of a new species of Anilocra were sent to the U. S.National Museum by Mr. W. J. Hoxie, of the Natural History Societyof Savannah, Ga. This is the third species of the genus known fromthe Atlantic coast of North America, the two species previouslydescribed being Anilocra laticauda Milne Edwards and A. pleheiaSchioedte and Meinert.
ANILOCRA ACUTA, new species.Body 34 mm. long and 12 mm. wide. Surface smooth.Color yellow, marked with numerous brown dots, which in themiddle of the dorsal surface of the last three segments of the thoraxalmost merge into a dark brown background, leaving a few wavylight areas on either side of the median line.The head is as long as wide, 4 mm. by 4 mm. The lateral marginsconverge slightly to a widely rounded anterior extremity. The eyesare large (1 mm. wide and 2 mm. long), distinct and composite, andare placed in the post-lateral angles. The antennae of the first pairare composed of eight articles and extend to the middle of the eyeon the lateral margin. The antennae of the second pair are composedof ten articles and reach the posterior margin of the head.The first segment of the thorax is the longest, 3 mm. ; the five fol-lowing segments are subequal, each about 2 mm. in length; theseventh segment is the shortest, 1^ mm. The thorax widens grad-ually from the first segment, which is 7 mm. wide, to the sixth,which is 12 mm. wide. Epimera are present on all the segmentswith the exception of the first; those of the second and third seg-ments are narrow, elongate, and posteriorly rounded; the last four
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are more acute at their extremities. The epimera of all the segmentsreach the post-lateral angles of their respective segments.The fii-st segment of the abdomen is the shortest, one-half mm.long; the three following are subequal, each being1 mm. in length; the fifth segment is 1^ mm.The lateral parts of the segments are drawn outposteriorly in acute processes. The sixth or ter-minal segment is as long as w^ide, 9 mm. by 9 mm.At the base it is 8 mm. and then widens a littlebefore converging to a triangular extremity withthe apex rounded. The branches of the uropodaare equal in length and do not reach the tip ofthe terminal abdominal segment by nearly 2 mm.
;
the outer branch is produced to an acute extremity;the inner branch is oblique, with the outer post-lateral angle acutely produced; the inner branch issomewhat wider than the outer branch.All the legs are prehensile.Three specimens were taken from a gar-pike.Tyjye-sj^ecimen.?Cat. No. 40939, U.S.N.M.This species difi"ers from the other two found onthe Atlantic coast, in the larger head, shorterantennae, larger eyes, which are also closer together, in the shapeof the head and the terminal abdominal segment, the much shorter
Anilocra acuta. X 2.
uropoda, and in the shape of the uropoda.