168 Umversity of California Publications in Zoology [Vou 23 
quite flat, 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.) juste 168 
vystria, p. 5 
B. Rostrum not armed with lateral spines, acuminate. Hye-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, pl. 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 
