236 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Telson of abdomen composed of seven plates. 



Measurements: Holotype male: carapace length, 2.7 mm; width, 3.6 

 mm; carpus of major cheliped, 2.5 by 1.8 mm; of minor cheliped, 1.8 

 by 1.5 mm. Ovigerous female paratype: length of carapace, 2.4 mm; 

 width, 3.6 mm; carpus of major cheliped, 2.2 by 1.8 mm; of minor 

 cheliped, 1.8 by 1.5 mm. 



Color: All traces of coloration are absent in both specimens. 



Ecology: Specimens were dredged in 3 fathoms from a bottom cov- 

 ered with mangrove leaves. There was no indication of commensalism. 



Relationships: This new species is closely allied to the other two 

 west American Polyonyx. It differs in having shallower orbits; side 

 walls of the carapace distinctly hairy; a longitudinal crest on the manus 

 of the major cheliped; carpus broader in relation to its length; more 

 hair on the manus and dactylus; a different size and arrangement of 

 spinules on the merus of the walking legs; and no movable spinules 

 on the propodus aside from the three posterodistal ones. From the very 

 small sample available it is impossible to tell whether all of these char- 

 acters are constant. 



Remarks: This is the first Polyonyx to be reported from the west 

 American coast south of the Gulf of California. It probably does not 

 occur within the Gulf, an area which has been intensively collected. 



The specific name is from the Latin confinis, closely related. 



Range: Known only from the type locality, Corinto, Nicaragua. 



Polyonyx quadriungulatus Glassell 

 Plate 41, fig. 2; text-fig. 12(1) 



Polyonyx quadriungulatus Glassell, 1935, p. 93, pi. 9 (type locality, 

 Estero de la Punta Banda, S of Ensenada, Baja California, Mex- 

 ico). Shen, 1936, p. 277. Haig, 1956b, p. 80. Probably not Stein- 

 beck and Ricketts, 1941, p. 458. 



Previous records: 



California. Santa Rosa, Santa Cruz, and Santa Catalina Islands: 

 Velero III and Velero IV (Haig). 



Baja California. Estero de la Punta Banda, S of Ensenada: S. A. Glas- 

 sell (Glassell). 



Diagnosis: Carapace subovate, distinctly broader than long; front 

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



