ORDER AMPHIPODxk. 211 



Here the second feet are terminated by a large pincer. 



PODOCERUS, Leach, 

 With projecting eyes. {Podocerus variegatus^ Leach.) 



Jassa, Leach. 



Eyes not projecting, {Jassa pulchella, Leach.) 

 Sometimes none of the feet are terminated by a large 

 pincer. 



CoROPHiUM, Lair. Cancer grossijoes, Lin. 



The second section, Heteropa, 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, Z«;.,^ 



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 arenarius, 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 ligioides, Risso.) 



The third and last section, Decempedes, Lat., is com- 

 posed of Amphipodes presenting but ten distinct feet. 



p2 



