168 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Previous records: 



Peru. San Lorenzo: U. S. Expl. Exped. (Dana). North Chincha Island, 

 Islas de Chincha: R. E, Coker (Rathbun). 



Chile. "Chile": (Guerin 1835); F. T. Delfin (Haig). Isla Alacran 

 near Arica; Pisagua; Junin; Caleta Buena: R. Paessler (Haig) 

 Iquique : F. Beumer ; F. Ringe ; Lund Univ. Chile Exped. ( Haig) 

 Cavancha: L. H. Plate (Lenz) ; Lund Univ. Chile Exped. (Haig) 

 S of Cavancha near Iquique: R. Paessler (Haig). Punta de Lobos 

 Tocopilla; Puerto Mejillones del Sur: Lund Univ. Chile Exped 

 (Haig). Antofagasta: A. Gassmann; R. Paessler (Haig). Taltal 

 R. Paessler (Haig). Peninsula Coquimbo; Montemar: Lund Univ 

 Chile Exped. (Haig). Valparaiso: Favorite (Guerin 1838b) 

 (H. Milne Edwards and Lucas) ; U. S. Expl. Exped. (Dana) 

 Vettor Pisani (Cano). Tumbes: L. H. Plate (Lenz). Bahia San 

 Vicente; W of Rocas Amazonas, Canal Chacao: Lund Univ. 

 Chile Exped. (Haig). 



Diagnosis: Carapace with a tuft of plumose hairs on front; cheli- 

 peds usually with vestigial plumose hairs, these hairs sometimes form- 

 ing a short pile over surface; anterior margin of carpus with lobe cut 

 into two teeth; manus covered with small granules, fingers nearly 

 smooth ; walking legs with long plumose hairs ; telson seven-plated ; a 

 pair of pleopods in male. 



Description: Carapace slightly broader than long, strongly convex 

 front to back, plicate on posterolateral regions, otherwise punctate; 

 naked except for a short tuft of plumose hairs on front. Front narrow, 

 rounded in dorsal view, trilobate in frontal view, the median lobe pro- 

 duced. Outer orbital angle produced into a tooth. Separated portion of 

 side wall consisting of one large piece and numerous small ones. 



Movable segments of antenna lightly granular, first sometimes with 

 a conical tubercle ; flagellum naked. 



Merus of chelipeds with short rugae and flattened granules ; anterior 

 margin with a strongly projecting, subtriangular, granulate lobe. Carpus 

 with a serrate- or granulate-edged lamellar lobe occupying proximal 

 two-thirds of anterior margin, usually divided by a notch near distal 

 end to form two teeth; lobe and carpus covered with small, flattened 

 granules, tending to become enlarged near and along posterior margin, 

 there forming irregular longitudinal rows. Manus covered with gran- 

 ules, somewhat larger, more rounded and more projecting than those 

 of carpus, especially toward outer margin. Fingers with small, much- 



