498 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Range. — From Coiba Island, Panama (Crossland), to Punta Arenas, 

 Patagonia (Lenz). 



Atlantic analogue. — P. faxoni Rathbun. 



Diagnosis. — A prominent ridge across carapace at cardiac level. 

 Lateral angles forming a prominent shoulder. Terminal segment of palpus 

 of third maxilliped reaching proximal end of merus. Abdomen of male 

 enlarging from middle of sixth segment; tip semicircular. 



Material examined. — 

 783-38. Darwin Bay, Tower Island, 40-70 fms, Jan. 16, 1938, 1 male, 

 2 females. 



Measurements. — Largest specimen, female: length 5.0 mm, width 

 9.4 mm. 



Habitat. — From the tubes of Chaetopterus variopedatus (Renier), 

 identified by Olga Hartman. (See pi. 84, fig. 7). 



Depth.— 2y2-70 fms. 



Remarks. — The occurrence of this commensal crab may be expected 

 wherever its widespread host, Chaetopterus, is found. This worm builds 

 a tube to which sand particles are attached by agglutination. 



P. transversalis is now recorded from the Galapagos Islands. 



Genus PINNAXODES Heller, 1865 



Pinnaxodes chilensis ( Milne Edwards) 



Plate 84, Figs. 3-5 



Pinnotheres chilensis Milne Edwards, Hist. Nat. Crust., vol. 2, p. 33, 



1837. 

 Pinnaxodes chilensis Smith, in Verrill, Amer. Nat., vol. 3, p. 245, 1869. 

 Rathbun, Bull. 97, U.S. Nat. Mus., p. 175, pi. 38, text f^g. Ilia 

 and b, and synonymy, 1918. Schmitt, Smithsonian Misc. Col., vol. 

 98, no. 6, p. 26, 1939. 

 Type locality. — ^Valparaiso, Chile. 

 Type. — In Paris Mus. 



Range. — Ecuador (Heller) to Port Otway, Patagonia (Albatross); 

 Galapagos Islands (Hopkins-Stanford Expedition). 



Diagnosis. — Carapace subquadrate with rounded corners, soft in fe- 

 male, firm in male. Female chelae elongate. A constriction about sixth 

 abdominal segment of male. 

 Material examined. — 

 154-34. Reef north of Tagus Hill, Albemarle Island, reef, Jan. 15, 

 1934, a single specimen contained within the test of the sea urchin, 

 Strongylocentrotus gibbosus (Valenciennes) (pi. 84, fig. 4). 



