3IO CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



more convex lower border of the upper orbital margin, the 

 longer merus of the external maxillipeds, and in its much 

 larger size, different granulation and coloring. The two 

 species are very different. 



From falustris (Milne-Edwards) this species is distin- 

 guished by the broader terminal segment of the abdomen, 

 the different markings on the inner surface of the larger 

 hand and the wider gap between the fingers. It resembles 

 U. minax, but has a broader and less convex carapace; 

 the meral joints of the ambulatory legs are narrower and 

 the carpus of the larger hand is not crested on the inner 

 side. It is not quite certain that the forms which Lock- 

 ington referred, somewhat doubtfully, to hrevifrons really 

 belong to this species. 



Tribe MACROURA. 



Family CALLIANASSID^. 



Lepidophthalmus gen. nov. 



Carapace laterally compressed and provided with a rostrum. Eye stalks 

 flattened and scale-like, the eyes not rudimentary. Antennules with 2 long 

 flagella. External maxillipeds with the ischium and merus operculiform and 

 the second joint of the palp large and much dilated. First pair of thoracic 

 legs unequal and chelate, the carpus and hand much wider than the pre- 

 ceding joints; second pair strongly compressed and furnished with small 

 chelae; third pair with the propodus flattened and expanded and furnished 

 with a dense felt of short hairs, the dactyl small. First abdominal segment 

 with a pair of uniramous appendages in both sexes; second pair of pleopods 

 biramous and slender, the 3 following pairs broad and foliaceous. Uropods 

 firm, not membranous or flexible, the outer ramus broad and thick, the 

 inner ramus very much smaller than the outer. Telson short and firm. 



This genus is quite closely allied to Calltatiassa, but 

 differs in having the second joint of the palp of the exter- 

 nal maxillipeds much dilated and in having the rami of the 

 uropods firm and very unequal instead of membranous and 

 of subequal size. 



