PART 1 



GARTH : PACIFIC OXYRHYNCHA 



73 



egg cavity, . . . female abdomen strongly indurated, outer surface 

 covered with closely set granules. (Stimpson, modified slightly) 



Cheliped of male more robust than that of female; palm high, 

 tapering distally, inner surface granulate, outer surface smooth and bare ; 

 fingers slender, gaping in a broad oval for basal three-fifths, touching 

 along crenulate edges for distal two-fifths ; propodus noticeably convex, 

 a low molariform tooth in gape on dactylus. 



4. Lower orbits of Collodes species. A. C. granosus, x 12.5. B. C. tumidus, x 12.5. 

 C.C. tenuirostris, x 1.25. (For C. gibbosus see Plate C, fig. 4; for C. robsonae 

 see Plate D, fig. 6). 



Material examined: A total of 132 specimens from 26 Hancock 

 stations, of which 10 were in the southern part of the Gulf of California, 

 including Isabel Island. (See Table 7) From near Punta Piaxtla, 

 Sinaloa, to Santa Elena Bay, Ecuador, but conspicuously absent from the 

 offshore islands. In addition three Askoy specimens from half a degree 

 south of the Equator (Garth, 1948, p. 23). 



Measurements: Female neotype: length 9.0 mm, width 7.2 mm. 

 Largest specimen, a male: length 11.8 mm, width 10.1 mm. 



Color in life: Carapace white, lightly covered with dull yellowish 

 brown. A violet gray area on gastric region and around [gastric] spine. 

 A violet gray area around large [cardiac] spine. Eye dark blackish 

 purple. Ambulatory legs white. Ventral side pale smoke gray with pure 

 white granules on abdomen. (Petersen, of a female from Secas Islands, 

 Panama) 



Habitat: A primary breakdown of bottom types at stations from 

 which this species was obtained by dredging shows sand 50 per cent, 

 mud 22 per cent, coral and coralline 18 per cent, and rock 10 per cent. 



