62 CALIFORNIA ACADEMY OF SCIENCES. 



Closely allied to bellus, but having the anterior portion of the antero- 

 lateral margin not so nearly transverse, the surface of the carapace more 

 eroded, the lateral teeth narrower and more nearly conical, the ambulatory 

 legs somewhat more slender and more prominently crested. The areola- 

 tion of the carapace is plain; the front is produced more than in bellus, 

 and divided jby a median notch, the lobes sinuate with the outer angles 

 produced as in the preceding species. Orbital fissures and teeth as in 

 bellus; lateral teeth of the carapace subconical, prominent and subequal, 

 the anterior one least acute. Subhepatic regions eroded, especially near 

 the orbits. Chelipeds unequal; merus irregularly dentate on the upper 

 margin; carpus and upper surface of the hand generally eroded or furnished 

 with a network of raised lines; hand with a lobe at the base as in bellus; 

 fingers light to dark brown. Merus of the ambulatory legs with an acute 

 upper margin which usually ends in a tooth near, but not at the distal 

 nd; carpus with a bilobed crest above; crest of the propodus with a lobe 

 near the base. Dactyls rather slender. 



Locality. Length. Width. 



Monterey, male. 13.5 mm. 18.5 mm. 



Santa Catalina Island, male. 12.5 mm. 17.75 mm. 



Southern California, male. 8.5 mm. 11.25 mm. 



" " female. 11.25mm. 14.75mm. 



West America, male. 13.5 mm. 18 mm. 



" " female. 10 mm. 13 mm. 



" " " 10 mm. 13 mm. 



La Paz, Lower California, male. 7.75 mm. 10 mm. 



" " " " " 6.5 mm. 8.5 mm. 



" " " " female. 1 mm. 9 mm. 



Monterey (Lockington)! Santa Catalina Island! San 

 Diego and Santa Rosa Island (Lockington), La Paz, 

 Lower California (Lockiiigton)! " Southern California," 

 two specimens (No. 17286 U. S. National Museum)! 

 San Clemente Island! San Diego! 



This species varies considerably as regards the rough- 

 ness of the carapace and legs. In some cases the ante- 

 rior part of the carapace and the upper side of the car- 

 pus and manus of the chelipeds are very much eroded, 

 but occasionally they are nearly smooth; the tubercle 

 on the middle of the surface of the niaxillipeds is often 



