THE CANCROID CRABS OF AMERICA 293 



Diagnosis. — Carapace wide, for the genus; rugose; edge thick. 

 Secondary tooth on wrist well developed ; palms oblong. 



Description. — Carapace slightly convex, flattened behind, punctate 

 and anteriorl}^ rugose, wider than the two preceding species; regions 

 separated and subdivided by shallow grooves, less distinct than in 

 C. vittatus. First lateral tooth depressed, last two small, postlateral, 

 last one absent in small specimens; margin thick, teeth short, sub- 

 acute. Front produced, more advanced at middle than at orbits; 

 lobes each with a shallow sinus, or almost straight, a well developed 

 outer tooth in small specimens. Abdomen broader than in C. 

 vittatus, second and penult segments shorter. Wrist and upper part 

 of hand very rugose; wrist with two blunt teeth at inner angle; 

 hands oblong, upper and lower margins subparallel ; fingers irregularly 

 toothed, not gaping, grooved. Legs hirsute on margins. 



Figure 46.— Cycloxanthops novemdentatus, male, dorsal view. After Holmes 



Color. — General color dull reddish brown, showing traces of 

 purple at posterior part of carapace and still more strongly on 

 ambulatory legs and below. Fingers black with teeth along pre- 

 hensile margins white. (Schmitt.) See under ^^ Material examined.'^ 



Measurements. — Male (17536), length of carapace 28, width of 

 same 43.2, fronto-orbital width 13.3, width of front 7.2 mm. Male 

 (19505), length of carapace 53.4, width of same 94.1, fronto-orbital 

 width 23.2, width of front 12.2 mm. 



Habitat. — Frequent under stones between tides (Baker). 



Remarks. — The form called rugosa by Holmes is probably a varia- 

 tion of novemdentatus, this species having great variation in roughness. 



Range. — From Monterey Bay, California, to Guadalupe Island, 

 Lower California, Mexico. 



