200 



University of California Publications in Zoology [Vol. 23 



abdominal segment, pointing upward and backward. Eostrum acute; tips of post- 

 orbital spines pointing forward; upper margin of orbit prominent but without 

 supraocular spine. Basal antennal joint with outer margin prolonged into a 

 slightly incurved spine. Sternum conspicuously granulate, or tubereulate, pubescent, 

 deeply grooved between segments. Chelipeds of male short, rather stout, granu- 

 late; hand broad, inflated; fingers nearly as long as palm, gaping at base. 

 Chelipeds of female more slender than in male; margins of hand parallel; fingers 

 slightly gaping. 



Fig. 123. Inachoides tuberculatum, <$, X 1%; a, dorsal; b, ventral view (from 

 Eathbun, U. S. N. M.). 



Dimensions. — Types, male: length 19.1 mm., width 14 mm.; female: length 

 14.2 mm., width 9.7 mm. 



. Type Locality. — San Diego Bay, California. 



Distribution. — From Monterey Bay, California, to Panama Bay, Panama, 

 4 to 45 fathoms (Eathbun). 



'Remarks — Inachoides magdalenensis and Dasygyius tuberculatum are apparently 

 one and the same species, and at Miss Eathbun 's suggestion I have here com- 

 bined them. 



II. Basal joint of antennae not extremely slender, often very broad; length less 

 than the distance between lower orbital margins, usually in the proportion 

 of two to three. (Group I, p. 194.) 



Genus Epialtus Milne Edwards 



Carapace smooth or slightly tuberculated ; margins not incised, with two or 

 more lateral projections, sometimes very largely developed. Eostrum broad, 

 triangular or oblong, bifid, or two spined, or entire. Basal antennal joint enlarged 

 at base and narrowing distally; flagellum of antennae concealed beneath the 

 rostrum. Preocular spine present or absent. Ambulatory legs stout, subcylin- 

 drical. 



