CALIFORNIA STALK-EYED CRUSTACEA. 27 



and spine-like than in Richii, and does not curve so strongly forwards, 

 Postero-lateral tubercle acute, prominent, spine-like. No sub-branchial 

 spine. Ischium of the maxillipeds grooved. .Chelipeds of the male large, 

 the merus with an irregular carina on the upper and inner margins; carpus 

 strongly carinated on the inner and upper margins and irregularly ridged 

 on the outer side; hand large, wider than in Richii, the upper edge acute; 

 fingers strongly gaping at base, meeting only at the tips, a tooth on the 

 movable one near the base. Chelipeds in the female smaller than in the 

 male, hand narrower, the fingers not gaping at the base. Legs longer and 

 more slender than in specimens of Richii of equal size; the joints not 

 carinated. 



The females have a broader carapace than the males and the gastric 

 region is more tumid, and the branchial regions more distinctly areolated. 



Length of carapace in male 11 mm.; width without spines 6.5 mm.; 

 length of cheliped 13 mm.; width of hand 3.3 mm. 



Santa Catalina Island, San Diego (Miss Rathbun); 

 San Pedro! off San Diego! 



Described from specimens received from Miss Rath- 

 bun. 



Subfamily DASYGYIN^ 



Eyes short, completely retractile. Postocular spine large. Basal anten- 

 nal joint considerably enlarged throughout its length. Kostrum simple or 

 bifurcated. Preocular spine present or absent. Legs generally slender. 



Genus Dasygyius Rathbun. 



(Microrhynchus BELL and Neorhynchus MILNE-EDWARDS preoc.) 



Kostrum short and simple. No preocular spine. Merus of maxillipeds 

 cordiform. Anterior legs in the male small. Ambulatory legs of moderate 

 length. 



Dasygyius tuberculatus (Lock.) 



Inachus tuberculatus LOCKINGTOX, Proc. Cal. Acad. Sci., Vol. VII, 1877, 



p. 30. 



Microrhynchus (Inachus) tuberculatus LOCKINGTON, 1. c., 1877, p. 64. 

 Neorhynchus mexicanus RATHBUN M., Proc. U. S. Nat. Mus., Vol. XVI, 



1893, p. 233. 

 Dasyfjyius tuberculatus RATHBUN M., 1. c., Vol. XXI, 1898, p. 570. 



