COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 105 



lobe on anterior margin. Carpus less than twice as long as wide; mar- 

 gins slightly converging distally ; proximal third to two-thirds of ante- 

 rior margin with enlarged, rough granules taking the form of spinules 

 in small specimens, giving margin an irregularly serrate appearance; 

 a low longitudinal crest along anterior third of dorsal surface, another 

 along center, and a third along posterior margin, these crests obsoles- 

 cent in some specimens; posterior crest rough, formed of oblique flat- 

 tened granules, ending distally in a small sharp tooth. Upper surface of 

 manus somewhat swollen, swollen portion covered with scattered large 

 granules ; outer margin with a smooth crest, defined by a distinct, broad 

 groove near outer margin and extending onto pollex. Gape with a short 

 thick tuft of pubescence, sometimes extending nearly to tips of fingers, 

 longer near their proximal end. 



Walking legs rugose; merus not inflated, not armed with spines, an- 

 terior margin with a fringe of short plumose hairs, surface and pos- 

 terior margin covered with non-plumose setae ; other segments covered 

 with long setae. 



Material examined: See Table 31. 



Measurements: Males, 3.3 to 5.7 mm; non-ovigerous females, 2.9 

 to 5.7 mm; ovigerous females, 4.0 to ca. 6.0 mm. The ovigerous female 

 holotype measures 4.7 mm in length, 4.7 mm in breadth. 



Color: The color in alcohol, according to Glassell (1936), was 

 red-brown mottled with white. A similar coloration was noted in Allan 

 Hancock Foundation specimens collected in 1954. 



Ecology: The tjpe series was taken "at low water from under 

 rocks" ; all the Hancock Foundation material was collected in the in- 

 tertidal zone under stones. Ovigerous females were recovered in April 

 and June. 



Remarks: Specimens collected by Fisher at Puerto Escondido 

 and Bahia de las Animas and referred by Lockington (1878) to 

 Petrolisthes rupicolus (Stimpson) [= P. cinctipes (Randall)] were 

 probably P. schmitti, the only Gulf of California species which might 

 be confused with it. 



Extensive intertidal collecting from the Velero III failed to re- 

 cover Petrolisthes schmitti anywhere in quantity. On the other hand, 

 a Hancock Foundation field party found it to be the most abundant 

 porcellanid at San Felipe, the type locality. 



Range: Gulf of California, from San Felipe south to Isla San 

 Francisco. 



