THE CANCROID CRABS OF AMERICA 



69 



Range. — Revilla Gigedo Islands, Mexico, and Cocos Island, Central 

 America. 



Material examined. — San Benedicto Island, Revilla Gigedo Islands; 

 A. W. Anthony; 3 males, 2 females (20696). 



Off Cocos Island; lat. 5° 32' 45" N., long. 86° 54' 30" W.; 66 

 fathoms; rky.; temperatm-e 58.4° F.; February 28, 1880; station 

 3368, Albatross; 1 male cotype (20608), 1 male cotype (4488, M. C. Z.). 



PORTUNUS (ACHELOUS) STANFORDI Rathbun 



Plate 31 



Porlunus (Achelous) brevimanus Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, 



p. 593; vol. 38, 1910, p. 578 (part; the Galapagos specimens). 

 Porlunus (Achelous) stanfordi Rathbun, Proc. Washington Acad. Sci., vol. 4, 



1902, p. 282, pi. 12, fig. 11 (type-locality, Tagus Cove, Albemarle Island; 



type. Cat. No. 24833, U. 



S.N.M.). 



Diagnosis . — Carapace 

 lumpy in the middle. Five 

 inner arm spines. No ter- 

 minal spine on manus. A 

 spine at postero-distal angle 

 of merus of last leg. 



Description. — Near hre?n- 

 manus, with which it is eas- 

 ily confused when of good 

 size. The configuration of 

 front, orbits and antero- 

 lateral teeth is similar, but 

 the lateral spine is trans- 

 verse, scarcely curved forward. Pubescence of carapace shorter and 

 more fugitive, postero-median area more lumpy, with three large 

 bosses in a triangle at inner angle of branchial region, and on the car- 

 diac region two bosses and in the very young a third, median. Arms 

 with five spines, sometimes six, on inner margin and one at extremity 

 of outer margin. Inner spine of carpus longer than any other cheliped 

 spine but about half as long as the same spine in hrevimanus. Manus 

 without terminal spine above, subterminal spine near the extremity, 

 about at the distal fifth; carina below the superior carina less parallel 

 to the latter than in hrevimanus, approaching nearer the top in the 

 proximal half. Merus of swimming leg half again as long as broad, 

 a single spine at postero-distal angle. Terminal segment of male ab- 

 domen narrower than in the allied species. 



Measurements. — Male (22032), total length of carapace 29, width of 

 same 48, width to anterior base of lateral spine 40.7, fronto-orbital 

 width 20, width of front 6.2 mm. 



-PoRTUNUs (Achelous) stanfordi, 



TYPE, DORSAL VIEW, X 15 



