ORDER AMPHIPODA — HYPERIA. 39 



Genus Hyperia, Latreille. Body subconical, short. Head moderately large, round nnd pointed in 

 front. Antennae short and setaceous. Feet simple, terminating- in a slender point, and sub- 

 equal. Three first rings of the abdomen very large ; the four following very small, and 

 forming a sort of caudal fin furnished laterally with three pair of long and slender appendices, 

 each terminating in two very minute lanceolated plates. Parasitic. 

 H. latrcilli. (Edw. An. Sc. Nat. Vol. 20, p. 388. Say, Lanceola pelagica, Ac. Sc. Vol. 1, p. 318. 

 Gould? loc. cit. p. 335.) Anterior pair of feet shortest ; third, fourth and seventh equal; fifth 

 longer ; sixth longer than the thorax. This species is probably the same noticed by Dr. Gould 



under the name of H. galba, Mont, as occurring in the pouches of the Medusa , on the coast 



of Massachusetts. Mr. Say's specimen was obtained from the Gulf stream. 



Genus Podocerus, Leach. Antenna? pediform ; the lower longest and much more robust, with the 



terminal joint inarticulate or obscurely jointed. The two anterior pairs of feet monodactyle; 



hands dilated; those of the second pair largest, the palms unarmed. Allied to Corophium. 



P. cylindricus. (Say, Jour. Acad. Nat. Sc. Vol. 1, p. 387 ) Hands of the second pair not larger than 



the carpus, somewhat cylindrical; third, fourth and fifth pairs of feet short, much compressed. 



Eyes small, not prominent. Length, 0*15. Hab. seaweed. Egg harbor, New- Jersey. 



