ORDER AMPHIPODA. 
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Here the second feet are terminated by a large pincer. 
Podocerus, Leach , 
With projecting eyes, ( Podocerus variegatus , Leach.) 
JASSA, Leacli. 
Eyes not projecting, (Jassa pulchella, Leach.) 
Sometimes none of the feet are terminated by a large 
pincer. 
Corophium, L,atr. Cancer grossipes , Lin. 
The second section, IIeteropa, Lat ., is composed of 
those which have fourteen feet, the last four of which, at least, 
are imperfect at the end, and exclusively proper for natation. 
It comprehends two subgenera, 
Pterygocera, Lat . , 
Which have the thorax divided into several segments ; four 
antennae furnished with hairs forming plumes ; all the feet 
natatory, and the last large and pinnated ; and cylindrical 
articulated appendages at the posterior extremity of the body. 
( Oniscus arenarim , Encyc. Method.) 
Apseudes, Leach . Eupheus, Risso. 
Which have also the thorax divided into many segments, but 
the two anterior feet are terminated by didactylous pincers; 
the following two are widened into a knob, terminating in a 
point, and denticulated on the edges ; the six following are 
slender and unguiculated at the end ; the last four are nata- 
tory ; the antennae are simple ; the body is narrow, elongated, 
with two long appendages, in the form of a thread, at their 
posterior extremity. ( Eupheus ligidides , Risso.) 
The third and last section, Decempedes, Lat., is com- 
posed of Amphipodes presenting but ten distinct feet. 
