CRUSTACEA 



335 



In the stenopodium (Figs. 222 D-G, 223) the two rami — an inner 

 endopodite and an outer exopodite — are set upon a common stem, the 

 protopodite. In many cases the protopodite bears also, on its outer 



Fig. 222. Limbs of Crustacea. Not drawn to scale. After various authors. 

 A, Maxilla of Mysis larva of Penaeus (Decapoda). B, Maxilla of Acanthosoma 

 larva of Sergestes arcticus (Decapoda). C, Second trunk limb of female 

 Cyclestheria hislopi (Conchostraca). D, Mandible of Calamis. E, Thoracic 

 limb of Nebalia. F, Mid-thoracic limb of an euphausid. G, Swimmeret of 

 the crayfish, bp. basipodite; br. branchia (epipodite); cp. coxopodite; en. en- 

 dopodite; ep. epipodite; ex. exopodite ;y?6. flabellum (exopodite) ; ^«. gnatho- 

 base; pr.cp. precoxa; 1-9, endites or segments of the limb. 



side, one or more processes known as epipodites (Fig. 223, ep). In 

 limbs in which the type is most perfectly developed the two rami are 

 subequal and are borne distally upon the protopodite (Fig. 222 G), 



