156 PROCEEDINGS OP THE ACADEMY OP 



orm, with its margin entire ■; apex obtuse. In the alcoholic specimens the 

 color of the body is yellowish-gray, clouded; lateral margins with a series of 

 black spots or blotches; base of abdomen black; caudal segments edged with 

 blackish ; eyes blue. Length of the body 0-76 ; greatest breadth 0-37 ; length 

 of caudal segments 0-20 inch. 



Two specimens are in the collection. It is perhaps an Acherusia, but we 

 have access to no figure or description of that genus of Lucas. 



Bopyroides acutimarginatus, nov. gen. et sp. 



We propose this name for a new parasitic anisopod which we are unable 

 to refer to any genus hitherto established, though it approaches very closely 

 to Bopyrus in form, and indeed in all its characters, except that the abdomi- 

 nal branchiae of the female are rudimentary, being merely transverse fleshy 

 ridges, instead of laminae. The upper surface, except the somewhat convex 

 head, is flat and smooth, with the segments sharply defined. The margins of 

 the body are very acute and somewhat recurved, especially at the head. The 

 abdomen is distinctly six-articulated, the joints being indicated by deep in- 

 cisions around the entire margin, dividing it into eleven subequal parts, so 

 that the terminal joint Ls very small, no larger than a lateral extremity of one. 

 of the preceding ones. It is 0-29 inch in length, and 0-21 in greatest breadth. 



It is found in the branchial cavity of Hippolyte brevirostris. 



Bopyrus hippolytes Kroyer, belongs properly to the same genus. From this 

 Species ours differs in the acuteness of the margins and in the sharply square- 

 cut lateral extremities of the abdominal segments. 



Caprella Kbnnerlyl. 



A large, pellucid species. Head armed with two small slender spines 

 above, in a transverse line over the eyes. No spines on the first thoracic 

 segment, and scarcely any on the second. The remaining segments, how- 

 ever, are armed with strong sharp tubercles on the sides, and a few smaller 

 ones above. These tubercles become progressively sharper posteriorly. Su- 

 perior antenna about one-half as long as the body ; peduncle very thick 

 and strong, with the first joint shorter than the second, and the last joint 

 two-thirds as long as the second ; flagellum very thin, filiform, equalling in 

 length the last joint of the peduncle, and consisting of twenty joints. Inferior 

 antennae small, reaching the middle of the second joint of the superior anten- 

 nae, su'upediform, and setose below. Branchial vesicles subovate, one-half 

 longer than broad. Hand of the second pair of feet elongated, nearly three 

 times as long as broad, thick and armed with two or three small slender teeth 

 on the concave palm. Feet of the three posterior pairs short. 



Length of the body 1-1 ; of the superior antennae 0-52 ; of the first and 

 second thoracic segments taken together 0*44 inch. The description is that 

 of a male. 



Found on the bottom of the Revenue Cutter at Port Townsend. 



Amphithoe hcmerams. 



Body robust, entire ; dorsum rounded, smooth and unarmed. Eye of mode- 

 rate size, rounded, situated on a short projection of the head between the 

 bases of the superior and inferior antennae. Superior antenna nearly as long 

 as the body, the peduncle constituting less than one-third of its length ; fla- 

 gellum tapering to an exceedingly fine extremity. Inferior antenna half as 

 long as the body, with its flagellum no longer than the antepenult joint of 

 the peduncle. Epimera of the fifth pair large. Gnathopoda, or feet of the first 

 two pair, with rather small, weak, subpediform hands in both sexes ; those of 

 the third and fourth pairs with the basal joint very large and much expanded, 

 nearly as broad as their epimera ; meros-joint in the same pairs small, com- 

 mune, 



