150 



CRUSTACEA. 



ments ; first and second feet two-fingered ; the first 

 the larger ; the second slender, many-jointed. 



A. nitescens. Fig. 281 ; n. s. 



Niha (Bisso). First feet dissimilar; the right 

 one being two-fingered ; the left simple ; second 

 pair slender, long, many-jointed, and minutely 

 two-fingered. 



N. edulis. Fig. 282 ; 1 n. s. 



281 



282 



283 



284 



Alpheus (Fabr.). Carapace forming a vault 

 over the eyes ; first feet two-fingered, very stout, 

 and differing much in form from each other ; second 

 pair slender, many-jointed, two-fingered. 



A. ruber. Fig. 283 ; n. s. 

 affinis. 



Family IV. Crangonim:. 



Crangon (Fabr.). First feet thick, the last 

 joint closing down like a fang upon a projection 



