m the Museum of the Smithsonian Institution. 127 

 Mippolyie ptisiola. 



Hlpiwlyte pusiola Kroyer, Monog. Fremst. Hippol., p. 111. ; pi. iii, fig. 

 69-73. 



This small species is easil}' distinguished from our other Hip- 

 poljtes by the smallness of its four-toothed rostrutn, which is 

 no longer titan the eyes. There is no sj^ine over the eye. 



I have found it abundantly in Massachusetts Bay, particularly 

 in Boston Harbor. It also occurred to me at Harpswell, Me. 

 It lives in the laminariau zone, and is most frequent among 

 eel-grass {Zoster a). 



Virbiiis pleiiracanlhus, nov. sp. 



Back depressed. Rostrum horizontally broad, and smooth at base, 

 acute, about half as long as the carapax, and scarcely more than half 

 as long as the acicle of the antenna?, but reaching to the extremity 

 of the penult joint of the peduncle of the antennulpe, and armed with 

 one or two teeth above, and one below near the extremity. There is 

 a small spine on each side at the base of the rostrum, above and a 

 little behind the base of the ocular peduncles. On the anterior mar- 

 gin of the carapax there is a spine beneath the eye, but no pterygos- 

 tomian spine. There is a sharp (hepatic) spine on the surface of the 

 carapax behind the base of the antennse. The scales of the antennae 

 are very large, as long as the carapax, and rather widening than nar- 

 rowing toward their extremities. The dactyli of the posterior three 

 pairs of feet are broad, compressed, and knifedike, with the inner 

 edges nearly straight, and armed with minute spiiies. The dorsal 

 angle of the abdomen at the third segment is very prominent, but not 

 acute. 



Length about one inch. 



It is easily distinguished from Y. acum,inatus by the great 

 size of the antennal scales, and the presence of an hepatic spine 

 on the carapax. 



It was dredged by me in the harbor of Norfolk, Ya., in June, 

 1853 ; and found abundantly at Somers' Point, in Great Egg 

 Harbor, N. J., in the summer of 1864. It lives among Zostera 

 just below low water mark. 



NOVEMBER, 1871. 9 Ann. Ltc. Nat. Hist. Vol. X. 



