1-^ 



10 PROCEEDINGS OF TTTE CALIFORNIA 



Carapax orbiculo-ovate, depressed, with short preorbital and post-orbital 

 spines. First joint of outer antennfe -wide, terminating outwardly in a long 

 spine, which is followed by three others, which form the inferior margin of 

 the orbit. Chelipeds of male, 2% times the length of carapax; those of fe- 

 male shorter than the second pair. Fingers serrate, obtuse and imperfectly 

 spoon-shaped at tija. 



This genus is evidently nearly allied to Mithrax, but the great length of the 

 first and second pairs of limbs in the male, as compared with the carapax, and 

 the row of teeth on the external margin of the fixed antennal joint, appear to 

 necessitate its separation. The general aspect of the single species here de- 

 scribed is totally different from that of WI. dichotomus or M. asper, which are 



the only two species I have seen figured. 

 Mi'c-)-opRru „ 

 22. Fisksda aepressa. 71 cv. 'if 



Male — Carapax depressed, widely pyriform, the regions marked by slight 

 elevations granulated on the summit, the margins and spaces between the ele- 

 vations somewhat tomentose. Kostrum bifid, short, reaching to the centre of 

 the terminal joint at base of outer antennse. A long spine at the external an- 

 gle of the fixed joint of outer antennae, succeeded by three smaller spines. 

 Movable base of outer antennte as long as flagelhrm, second joint largest, sec- 

 ond and third joints slender, cylindrical. 



Upper surface of carapax almost sjuneless, margins and orbits spinous. Or- 

 bit with two teeth above and four acute spines below, the two anterior of 

 which belong to the fixed joint of antennte. A row of teeth on the hepatic re- Swl 

 gion, continued outwards from the maxillipeds. 



Chelipeds of male enormously long, ischiitm produced into an acitte spine 

 on its anterior border; meros rounded, as long as post-rostral jDortion of cara- 

 pax, beset with acute spines on its upper surface; carpus short, tuberculated ; 

 manus slightly longer than entire length of carajiax (measuring to the end of 

 the fixed finger); entirely smooth, compressed and broad, with rounded upper 

 and lower edges; dactyli gaping, their obtitse ends imjoerfectly spoon-shaped 

 and serrated, movab'e finger with a tubercle at half its length on inner border. 

 Second pair 1 ^ times as long as carapax, meros similar to that of first pair, 

 with a row of about ten long spines on its upper surface, and a single spine 

 on the distal extremity of its lower; carpus with a few spines; propodus very 

 slender-, entirely imarmed. Three hinder pairs similar to second pair, all 

 with a single spine at distal end of underside of meros. Four hinder pairs 

 sparsely hirsute above. 



M. M. 



Length of carapax 27 



Width of ditto 24 



Length of first pair 68 



Length of manus of ditto ... 33 



Length of second pair 42 



Length of fifth pair 33 



These measurements are taken from the largest of six male specimens from 

 Port Escondido, Lower California. 



