168 University of California Publications in Zoology [Vol. 23 



quite fiat, more or less quadrilateral in outline, dorsal surface usually rugose, 

 sometimes spinose, but occasionally glabrous, and either prominently or obscurely 

 tuberculated. 



Key to the California Species of Munidopsis 



I. Abdomen unarmed. Eye-stalks spined above. Rostrum acuminate, laterally 

 unarmed. Chelipeds hairy. (Known only from 684+ fathoms.) 



verrilli, p. 169. 

 II. Abdomen armed with spines or tubercles. 



A. .Rostrum laterally spined. Eye-stalks spined above. Dorsal armature 



of abdomen not confined to median line. Chelipeds hairy. (Known 



only from 302 + fathoms.) 



hystrix, p. 168. 



B. Rostrum not armed with lateral spines, acuminate. Eye-stalks not 



spined. Dorsal armature of abdomen confined to median line. 



1. Anterior margin of carapace with a small, serrated lobe on either 



side of base of rostrum behind ocular peduncle; lateral margins 



arcuate. Chelipeds hairy. (Not known north of Santa Catalina 



Island.) 



aspera, p. 171. 



2. Anterior margin of carapace straight, at right angles to lateral mar- 



gins; lateral margins straight. Chelipeds not hairy. 



quadrata, p. 170. 



Munidopsis hystrix Faxon 



Munidopsis hystrix Faxon, Bull. Mus. Comp. Zool., 24, 183, 1893; Mem. 

 Mus. Comp. Zool., 18, 89, pi. 19, figs. 1, la, 1895 ; Rathbun, H. A. E., 

 10, 166, 1904. 



Fig. 107. Munidopsis hystrix, X about % (after Faxon). 



Characters. — Rostrum long, lightly curved upward from the base to the tip, 

 and armed with from two to five spines on each side; spines unsymmetrically 

 arranged on the two sides. Eye-stalks armed with a single spine above. Carapace 

 setose and thickly covered with small spinous tubercles; three spines of special 

 prominence on the gastric area disposed in the form of a triangle, with apex 



