PART 1 GARTH : PACIFIC OXYRHYNCHA 459 



and its surface concave toward the anteroinferior angle, no notch for the 

 insertion of the palpus ; palpus, except at its origin, concealed beneath the 

 other [segments] of the endognath. 



Chelipeds resembling those of [Parthenope], except with the fingers 

 very small, and the dactylus generally at right angles with the palm 

 when retracted. Terminal [segments] of the ambulatory [legs] acumi- 

 nate. 



Third, fourth, and fifth [segments] of the male abdomen [fused]. 

 (Stimpson, modified) 



Range: Eastern Pacific from Tepoca Bay, Gulf of California, 

 Mexico, to Santa Elena Bay, Ecuador ; Revilla Gigedo Islands ; Galapa- 

 gos Islands. Western Atlantic from off Cape St. George, west coast of 

 Florida, to Barbados; Panama. In the Pacific, 1.5 to 60 fathoms; in the 

 Atlantic to 338 fathoms. 



Solenolambrus arcuatus Stimpson 

 Plate Z 3 , Figs. 9, 9a ; Plate 52, Fig. 1 



Solenolambrus arcuatus Stimpson, 1871a, p. 101. A. Milne Edwards, 

 1878, p. 162. Rathbun, 1910a, p. 576; 1925, p. 538. Finnegan, 

 1931, p. 625. Garth, 1946, p. 413, pi. 69, figs. 3, 4; 1948, p. 31. 

 "^Solenolambrus typicus, Cano, 1889, pp. 102, 187. Not S. typicus Stimp- 

 son. 



Type: Female holotype, length 10.2 mm, width 13.2 mm, merus of 

 cheliped 7.9 mm, length of hand 9.4 mm ; not extant. 



Type locality: Panama, Capt. J. M. Dow, collector. 



Localities subsequently reported, with collectors: Panama: Panama, 

 Vettor Pisani (Cano, as Solenolambrus typicus) ; St. Elmo Bay [Bahia 

 Santelmo], Isla del Rey, Perlas Islands, 6-9 fathoms, St. George (Fin- 

 negan) and 11-14 m, Askoy (Garth, 1948). Colombia: Malaga Bay, 

 4-9 m, Askoy (Garth, 1948). Ecuador: Hood and Albemarle Islands, 

 Galapagos Islands, 10-60 fathoms, Velero III (Garth, 1946) ; Cape 

 Pasado, 18 m, Askoy (Garth, 1948). 



Atlantic analogue: Solenolambrus typicus Stimpson. 



Diagnosis: Two erect prominences on midline of carapace, one car- 

 diac, one gastric ; a smaller tooth at mid-point of branchial ridge. Superi- 

 or crests of manus 9-toothed, surface between crests smooth; retracted 

 dactyl at right angles with palm. Sternum between chelipeds smooth, 

 concave. Male first pleopod short, thick, thigh-shaped; groove open 

 basally, lip of groove produced, plumosely setose, a dense covering of 



