PART 1 GARTH : PACIFIC OXYRHYNCHA 295 



Range: From Rocky Point, Sonora, Mexico, to La Libertad, Ecua- 

 dor; Atlantic ocean from Beaufort, North Carolina, to Bahia, Brazil. 

 Shore to 55 fathoms. 



Key to the Pacific American Species of Notolopas 



la. Posterior portion of carapace with upturned margin; cardiac 

 region depressed. Merus of outer maxilliped subquadrate. Tip 

 of male first pleopod conical lamellatus 



lb. Posterior portion of carapace without upturned border; cardiac 

 region elevated, dome-shaped. Merus of outer maxilliped sub- 

 triangular. Tip of male first pleopod triangular . mexicanus 



Notolopas lamellatus Stimpson 

 Plate Q, Fig. 8 ; Plate 33, Fig. 1 



Notolopas lamellatus Stimpson, 1871a, p. 97. A. Milne Edwards, 1875, 

 p. 71. Miers, 1886, pp. 64, 65, pi. 8, fig. lc. Rathbun, 1910, p. 572; 

 1925, p. 287, pi. 81 ; pi. 238, fig. 1, text-fig. 95. Garth, 1948, p. 26. 



Pelia orbiculata Finnegan, 1931, p. 621, text-fig. 4; type locality, Balboa, 

 Panama ; female [not male] holotype in British Museum. 



Type: Cotypes, including a measured male, length 16 mm, width 8.9 

 mm, originally in the collections of the Smithsonian Institution, no longer 

 extant. 



Type localities: Panama, Captain J. M. Dow, and Manzanillo, 

 Mexico, J. Xantus, collector. 



Localities subsequently reported, with collectors: Nicaragua: Corinto 

 and Carbon [Cardon] Island, Corinto, J. A. McNiel (Rathbun, 1925). 

 Costa Rica: Puntarenas, P. Biolley (Rathbun, 1925). Panama: Taboga 

 Island and Panama City, J. Zetek (Rathbun, 1925) ; "Panama," Hassler 

 (Rathbun, 1925) ; Balboa, St. George (Finnegan, as Pelia orbiculata) ; 

 Pinas Bay and Guayabo Chiquito, Askoy (Garth). Colombia: Ardita 

 Bay and Malaga Bay, Askoy (Garth). 



Atlantic analogue: The species itself is said by Rathbun (1925) to 

 occur in the Atlantic, on the strength of an ovigerous female from off 

 Beaufort, North Carolina. 



Diagnosis: Posterior margin of carapace sharply rimmed, a stout 

 median spine. Cardiac region depressed. Rostrum long, horns widely 

 diverging. Basal antennal article with a strong lobe on outer margin. 

 Merus of external maxilliped subquadrate. Tip of male first pleopod 

 acute, subconical, well separated from opposing fold bearing the aperture. 



