48 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Previous Pacific records: 

 Clipperton Island: Presidential Cruise of 1938 (Schmitt) ; Scripps Inst. 



of Oceanography Exped. (Hertlein and Emerson). 

 Costa Rica: Velero III (Haig 1956a). 

 Panama. "Panama": Velero III (Haig 1956a). Isla Flamenco: E. Festa 



(Nobili). Isla Contadora and Isla Saboga, Islas de las Perlas: 



Askoy (Haig 1957b). Isla del Rey, Islas de las Perlas: W. G. Van 



Name (Boone 1931). Guayabo Chiquito: Askoy (Haig 1957b). 

 Colombia. "Colombia": Velero III (Haig 1956a). Bahia Humboldt; 



Bahia Utria; Isla Gorgona: Askoy (Haig 1957b). 

 Ecuador. Isla La Plata: Askoy (Haig 1957b). Bahia de Santa Elena: 



E. Festa (Nobili). 

 Galapagos Islands. "Galapagos Islands": Velero III (Haig 1956a). 



? Bahia de la Academia, Isla Indefatigable: R. Blomberg (Hult). 



Bahia de Gardner off Isla Hood: W. Beebe on A returns (Boone 



1932). 



Diagnosis: Carapace nearly smooth, laterally plicate; a single epi- 

 branchial spine; no strong supraocular spine, but one or two supra- 

 ocular spinules sometimes present; front sinuously triangular; carpus 

 less than twice as long as wide, anterior margin with four (rarely five 

 or six) serrate-edged teeth; manus with a longitudinal crest of large 

 flattened granules; merus of walking legs with a row of spines on an- 

 terior margin, that of legs 1 and 2 spined at posterodistal angle. 



Description: Carapace nearly smooth except for plications on pos- 

 terolateral regions; covered with a fine pubescence, latter very short 

 on adult specimens, longer in young. Front sinuously triangular, 

 rounded at tip, with a deep median groove; no strong supraocular spine, 

 but one to three small supraocular spinules often present. Outer orbital 

 angle produced into a spine. A single, strong epibranchial spine. 



First movable segment of antenna with an anterior lamellar projec- 

 tion, serrate on its margin and bearing one to three spines; second 

 covered on anterior side with small, projecting granules; third nearly 

 smooth; flagellum naked. Outer maxillipeds rugose. 



Merus of chelipeds rugose, with a large serrate-edged tooth on an- 

 terior margin. Carpus pubescent, more distinctly so in young speci- 

 mens; less than twice as long as wide; armed on anterior margin with 

 four serrate-edged, spine-tipped teeth similar to meral tooth, a smaller 

 fifth tooth (and rarely a sixth) sometimes present; surface roughly 

 granulate, the largest granules forming a median longitudinal crest; 



