270 



THE CRUSTACEA 



most Penaeidea and in the Stenopidea and Astacura (Fig. 161), the 

 first four or all five pairs in the Eryonidea (Fig. 162), the first two 



FIG. 160. 



Psathyrocaris fragilis (Pasiphaeidae), showing the greatly developed exopodites of the thoracic 

 legs (a " Schizopod " character) and of the pleopods. (After Alcock. 



Fio. 161. 



Nephropsis Carpenteri (Nephropsidae), . A deep-sea species in which the eyes have almost 

 disappeared but the vestigial eye -stalk can be seen below the rostrum. i(From Alcock, 

 Naturalist in Itidian Seas.) 



in most Caridea, the first or the first two in Thalassinidea (Fig. 

 149, p. 260), and the first pair only in the other Anomura (Fig. 150, 



