COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 239 



also on their inner surfaces. Legs hairy dorsally, and often the cara- 

 pace also more or less hairy. Dactyli of the walking legs with the dorsal 

 claw much smaller than the ventral claw, and bearing 2 or 3 accessory 

 spinules." 



Aside from Polyonyx nitidus Lockington, P. quadriungulatus is most 

 closely related to the western Atlantic species P. gibbesi Haig. In the 

 Atlantic form the orbits are very slightly deeper than in P. quadriungu- 

 latus ; the outer margin of the manus of the minor cheliped is markedly 

 outcurved, especially in males; on the same manus the dorsal longi- 

 tudinal crest is obsolescent or absent; and movable spinules are lack- 

 ing on the propodus of the walking legs, except for the three postero- 

 distal ones. P. utinomii Miyake, 1943, which is known only from 

 Honshu Island, Japan, appears to be very closely allied to P. quadri- 

 ungulatus, P. nitidus, and P. gibbesi. 



Range: Santa Rosa, Santa Cruz, and Santa Catalina Islands off the 

 California coast ; Estero de la Punta Banda south to Punta San Eugenio, 

 Baja California. Shore to 26 fathoms. 



Polyonyx nitidus Lockington 

 Text-fig. 12(2) 



Polyonyx nitidus Lockington, 1878, pp. 396, 405 (type locality, Baja 

 California, Mexico, exact locality unknown). Shen, 1936, p. 276. 

 Haig, 1956b, p. 81. 



IPolyonyx quadriungulatus, Steinbeck and Ricketts, 1941, p. 458. Not 

 P. quadriungulatus Glassell. 



Previous records: Gulf of California. "Lower California" [prob- 

 ably Gulf]: Fisher (Lockington). El Mogote: J. Steinbeck and E. F. 

 Ricketts (Steinbeck and Ricketts) [probably this species]. 



Diagnosis: Carapace subovate, distinctly broader than long; front 

 transverse in frontal view ; merus with a strong lobe on anterior margin ; 

 anterior margin of carpus with a convex crest, its proximal end sub- 

 rectangular; outer margin of manus and pollex with a row of fine gran- 

 ules and a thick fringe of plumose hairs; manus of major cheliped 

 swollen, without a crest on dorsal surface, that of minor cheliped with 

 a low longitudinal crest; merus of walking legs with a row of about 12 

 spinules on posterior margin, that of leg 3 about twice as long as 

 wide; propodus with three posterodistal movable spinules, one just be- 

 hind them, and one on middle or proximal third of posterior margin, 

 that of leg 3 over twice as long as wide; dactylus with three large, in- 



