194 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Anton Dohrn; near Point del Rey, Santa Monica Bay; San Pedro, E. 

 P. Chace; and Long Beach, H. N. Lowe (all Rathbun, 1925) ; Laguna 

 Beach (Hilton; Nininger) ; La Jolla, W. L. Schmitt (Rathbun, 1925) ; 

 San Diego, H. Hemphill (Loclcington) ; Rosa Smith (Rathbun, 1894) ; 

 San Diego Bay, 6.5 fathoms, Albatross (Rathbun, 1925). 



Fossil: California Pleistocene: Nob Hill and Deadman Island, San 

 Pedro; Signal Hill (Los Cerritos) ; Spanish Bight, San Diego (Rath- 

 bun, 1926). 



Atlantic analogue: None. A Pacific north temperate species. 



Diagnosis: Carapace constricted at base of hepatic tooth; hepatic 

 tooth narrow and incompletely joined to postorbital, its outer margin 

 trending in a transverse direction. Carapace tuberculate, tubercles of a 

 size. Surface of external maxillipeds smooth and devoid of furrows. 

 Legs moderately long, meri and propodi noncarinate, male cheliped 

 massive but uncrested. Male first pleopod with tip thickened and 

 pointed, two strong opposing projections, one on either side of median 

 cleft; an intervening rounded lobule. 



Description: Carapace ovate, tuberculated ; median region tumid and 

 furnished with four tubercles, the three anterior ones nearly abreast 

 (the anterior one a little in advance of the others) ; two double rows 

 of curved setae in front of the lateral tubercles, and two similar rows 

 on the rostrum. Cardiac and intestinal regions each furnished with a 

 tubercle ; two tubercles on the branchial region, the one situated before 

 the other. Rostrum prominent, the horns divaricate and convex above, 

 the triangular notch between them hairy. Supraorbital tooth acute and 

 directed forward, outward, and upward. Postorbital tooth acute and 

 triangular. Behind the postorbital [tooth] a large, rather slender tooth 

 projecting laterally, the tip curving forwards. At the posterolateral 

 angle of the carapace a prominent, pointed tubercle; in front of it the 

 margin furnished with curved setae. A spine on the subbranchial region 

 below the middle of the space between the posterolateral tubercle and 

 the large, curved tooth. Pterygostomian region with three to six small 

 teeth. Surface of the ischium of the maxillipeds plane, but sometimes 

 bearing a trace of a longitudinal groove ; exognath not grooved. 



Chelipeds large in the adult males, much shorter and more slender in 

 the females ; the merus bearing a few tubercles on the upper side but no 

 carina ; the inner side sometimes becoming strongly ridged in adult males, 

 but generally rounded in young males and females ; the carpus with two 

 or three cristae becoming more prominent in old males; hands com- 

 pressed, the upper edge acute ; fingers shorter than the palm, and gaping 

 at the base in old males. 



