COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 33 



sal surface; tubercles often produced into spinules along outer margin. 

 Fingers covered with flattened tubercles similar to those on manus; 

 gape with pubescence produced into a long tuft on proximal half of 

 fingers. 



Walking legs rugose; merus and carpus with a fringe of plumose 

 hairs on anterior margin, all segments covered with long, non-plumose 

 setae; anterior margin of merus of leg 1 with six to eight spines, of leg 

 2 with six to eight, of leg 3 with three to seven ; merus of legs 1 and 2 

 with one or two posterodistal spines. 



Ventral surface of chelipeds and walking legs rugose; abdomen 

 rugose. 



Material examined: See Table 4. 



Measurements: Males, 2.9 to 9.9 mm; non-ovigerous females, 6.1 

 and 6.5 mm; ovigerous females, 5.5 to 8.3 mm. The male holotype 

 measures 5 mm in length, according to Faxon ( 1893) . The present writer, 

 who examined the type specimen, recorded a measurement of 9.9 mm. 



Color: Color in alcohol reddish, lighter below, the pigment assum- 

 ing the form of spots on the basal parts of the abdomen; a large blood- 

 red spot on the propodite of the outer maxillipeds. (Faxon, 1895) 



Ecology: This species has been found under stones in the littoral 

 zone, usually at low tide. It was taken by the Askoy Expedition from 

 coral dredged at 2 fathoms. 



Ovigerous females have been collected in January, March, and 

 May. 



Remarks: The range of Petrolisthes agassizii is here extended from 

 Panama northward to Mazatlan at the mouth of the Gulf of California. 

 The species apparently does not occur inside the Gulf. 



Range: Mazatlan, Gulf of California, south to Bahia Utria, Co- 

 lombia. Shore to 2 fathoms. 



Petrolisthes edwardsii (Saussure) 

 Plate 21 



Porcellana edwardsii Saussure, 1853, p. 366, pi. 12, fig. 3 (type local- 

 ity, Mazatlan, Gulf of California). Stimpson, 1857b, p. 480. 



Petrolisthes edwardsii, Stimpson, 1858, p. 227. Rathbun, 1910, p. 600. 

 Schmitt, 1924a, p. 170. Boone, 1932, p. 39, text-fig. 10. Glassell, 

 1938a, p. 443. Steinbeck and Ricketts, 1941, p. 456, pi. 22, fig. 2. 

 Not Boone, 1931, p. 152, text-fig. 7. 



