PART 1 GARTH : PACIFIC OXYRHYNCHA 229 



Localities subsequently reported, with collectors: Gulf of California, 

 Mexico: Patos Anchorage, 4.5 fathoms, Fred Baker (Rathbun, 1924c) ; 

 Santa Inez Bay, 0-2.5 fathoms, Zaca (Crane) ; San Marcos Island, John- 

 son and Baker (Rathbun, 1925) ; Coronadofs] Island (Steinbeck and 

 Ricketts, 1941). 



Diagnosis: Hepatic and branchial width subequal; anterior margin 

 of hepatic lobe transverse. Male rostrum elongate, tip bifurcate. Gastric 

 region with three tubercles in a backward pointing triangle. Chelipeds 

 of male massive, meri grossly enlarged, tuberculate ; fingers gaping in a 

 broad oval. Propodi of ambulatory legs with setiferous projections at 

 midpoints. Male first pleopod a simple cylinder thickened to tip, open- 

 ing on convex side unprotected, a row of spinules along concave margin. 



Description: Rostrum larger than usual for the genus, the emargi- 

 nated extremities divergent. Transorbital width small. No preorbital or 

 postorbital spine. Anterolateral margin with two triangular teeth, the 

 anterior [pair] much the larger, their front margin at right angles to 

 the carapace . . . Distance from the anterior line of the first teeth to tip 

 of rostrum about equal to the posterior portion of the carapace. First 

 pair of feet [chelipeds] in the male longer than the second [first am- 

 bulatories], fingers obtuse and imperfectly spoon-shaped at their tips. 

 Eight posterior legs slender, cylindrical, naked, except terminal segment, 

 this segment fringed below with short setae. Penultimate segment 

 with one or two small spines [compact clusters of hair] on the under 

 side. 



Carapace of the largest female stouter and broader than that of the 

 largest male, and in some of the females the manus tuberculated. (Lock- 

 ington) 



The above description, modified in no essential, represents Locking- 

 ton at his best. Even without the aid of a pencil sketch by J. S. Kingsley 

 of what was in all probability a cotype (Rathbun, 1925, fig. 57a), the 

 species is clearly recognizable. 



Material examined: A total of 37 specimens from 18 stations, 15 of 

 which were in the Gulf of California. (See Table 44) From Lagoon 

 Head Anchorage, west coast of Lower California, and Puerto Refugio, 

 Angel de la Guarda Island, Gulf of California, to Acapulco, Mexico. 

 In addition to the above, the writer has on loan from the California 

 Academy of Sciences the male from San Marcos Island figured by 

 Rathbun (1925, pi. 47, fig. 1). 



