COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 139 



Remarks: The specific name, from the Latin calculosus, pebbly, was 

 suggested by the granular appearance of the cheh'peds. 



Range: Acapulco, Mexico, south to La Libertad, Ecuador. 



Pachycheles setimanus (Lockington) 

 Plate 31, fig. 2 

 Petrolisthes (Pisosoma) setimanus Lockington, 1878, pp. 396, 402' 

 (type localities, Bahia Mulege and Isla San Jose, Gulf of Cali- 

 fornia). 

 Pachycheles panamensisf, Schmitt, 1924b, p. 385. Not P. panamensis 



Faxon. 

 Pachycheles setimanus, Glassell, 1936, p. 292; 1938a, p. 444. Stein- 

 beck and Ricketts, 1941, p. 456. 



Previous records: Gulf of California. Bahia de Tepoca, Sonora: 

 F. Baker (Schmitt). Bahia Mulege: (Lockington). Bahia Concep- 

 cion: J. Steinbeck and E. F. Ricketts (Steinbeck and Ricketts). Isla 

 San Jose: (Lockington). Pulmo Reef: J. Steinbeck and E. F. Rick- 

 etts (Steinbeck and Ricketts). 



Lectotype: Male, 6.4 mm in length by 6.9 mm in width, in Paris 

 Museum, labelled "Petrolisthes setimanus Lockington. Californie — Lock- 

 ington 6-99 (Type)." This specimen is hereby designated lectotype 

 at the request of Mr. Jacques Forest. 



Diagnosis: Carapace practically devoid of hairs; carpus covered 

 with large granules, depressed or obsolescent on anterior two-thirds 

 and strongly projecting on posterior third, its anterior margin with 

 three strong granular teeth ; manus with rounded granules, its surface 

 and that of carpus thickly covered with long plumose hairs, longer to- 

 ward outer margins; fingers devoid of hairs, nearly smooth; walking 

 legs covered with long plumose hairs and a few scattered, non-plumose 

 setae; telson seven-plated; a pair of pleopods in male. 



Description: Carapace about as broad as long in males, slightly 

 broader (LI or 1.2 times) in females; posterolateral and frontal re- 

 gions plicate, surface otherwise smooth or punctate; naked except for 

 traces of pubescence on anterior regions, not visible except under high 

 magnification, or at most with a few long, scattered plumose hairs in 

 occasional specimens. Front rounded in dorsal view, trilobate in frontal 

 view, the median lobe rounded and produced. Outer orbital angle pro- 

 duced into a strong tooth. Separated portion of side wall consisting 

 of one large piece and usually a few fragments. 



