92 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Anasimus rostratus Rathbun, 1893b, p. 227; type locality, northwest of 

 Cedros Island, off Lower California, 58 fathoms; female holotype, 

 U.S.N.M. No. 17340; 1904, p. 171, pi. 10, fig. 4. Weymouth, 

 1910, p. 27. 

 Anasimus spinosus, Schmitt, 1921, p. 196, text-figs. 121a, 121b. 



Type: Male holotype, U.S.N.M. No. 17341, length 10 mm, width 

 6 mm. 



Type locality: Off San Diego, California, 36 fathoms, Albatross 

 station 2934. 



Localities subsequently reported, with collectors: California: Off 

 Santa Rosa Island, 38-55 fathoms, and off San Nicolas Island, 32-33 

 fathoms, Albatross (Rathbun, 1925) ; Santa Catalina Island: Catalina 

 Harbor, W. H. Dall (Rathbun, 1904) ; Catalina and Isthmus harbors, 

 Anton Dohrn, and off Santa Catalina Island, 50 fathoms, H. N. Lowe 

 (Rathbun, 1925) ; off La Jolla, 30-39 fathoms, Scripps Institution 

 (Rathbun, 1925). Mexico: west coast of Lower California: west of 

 Los Coronados Islands, 50 fathoms, Agassiz (Rathbun, 1925) ; north- 

 west of Cedros Island, 58 fathoms, type locality of Anasimus rostratus, 

 Albatross (Rathbun, 1893b) ; off Abreojos Point, 48 fathoms, Albatross 

 (Rathbun, 1925). Gulf of California: Santa Inez Bay, 60 fathoms, 

 Zaca (Crane). 



Atlantic analogue: None. A Pacific north temperate species. 



Diagnosis: Sexes markedly dissimilar. Rostrum a slender spine half 

 as long as postrostral portion of carapace in male, shorter in female. 

 Two median spines, one gastric, one cardiac ; one long branchial spine. 

 Postorbital spine small. Chelipeds very long, from three to four times 

 length of carapace in male, only one and a half times carapace length in 

 female. A spine on first abdominal somite. 



Description: Male: Carapace spinous; two spines on the median line, 

 one on posterior part of the gastric region and the other on the cardiac 

 region ; one long spine on the branchial region, with a small one in 

 front of it and two on the margin ; a spine on the margin of the hepatic 

 region and two very small ones arranged transversely on the gastric 

 region ; a slender spine on the orbital arch. Rostrum slender, spinulous 

 on the margins, about one-half the length of the postfrontal portion of 

 the carapace. Postorbital spine small, at some distance behind the eye. 

 Abdomen bearing a spine on the first segment. Chelipeds nearly three 

 times as long as the carapace, granulate ; merus one-spined above at 

 the anterior margin ; hand slender, slightly flattened vertically, increasing 

 in width toward the distal end; dactyl and pollex arched, gaping for 



