COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 47 



Material examined: See Table 9. 



Measurements: Males, 2.9 to 13.1 mm; non-ovigerous females, 3.0 

 to 11.1 mm; ovigerous females, 5.5 to 6.6 mm. The size of Lockington's 

 types was not stated. The material examined apparently includes the 

 largest specimens to be recorded. 



Color: "This species is not nearly as brightly colored in life as it is 

 in alcohol, the preservative intensifying the coloration for a considera- 

 ble time. In life it is a light red mottled with cream, spines and lobes, 

 yellow to white margined with a deep red ; the undersides of the hands 

 are very conspicuous, a bright pink." (Glassell, 1937) 



Ecology: Unlike its closest relative, Petrolisthes marginatus, which 

 occurs most frequently in coral heads, the present species is most often 

 found under stones in the intertidal zone. It has, however, been taken 

 from coral on a few occasions, to a depth of 2^^ fathoms. The Velero 

 III once dredged it in 22 fathoms from a coral rock substrate, along 

 with P. marginatus; this depth is exceptional for both species. 



Females were taken in abundance in January, February, and March. 

 Of all these, only eight out of 72 collected in March were ovigerous. 

 The culmination of the breeding cycle undoubtedly occurs later in the 

 year, when the Gulf of California is rarely visited by collectors. 



Remarks: Petrolisthes hirtispinosus appears to be strictly confined 

 to the Gulf of California, and to be abundant throughout its range. 



Range: Gulf of California, from Bahia de Tepoca, Sonora, south 

 to Cabo San Lucas. Shore to 2^^ fathoms; exceptionally to 22 fathoms. 



Petrolisthes marginatus Stimpson 

 Plate 20, fig. 1 



Restricted synonymy: 



Petrolisthes marginatus Stimpson, 1858, p. 227 (listed only; type local- 

 ity, Antilles) ; 1859, p. 74 (description; type locality restricted to 

 Barbados). Schmitt, 1939, p. 16. Haig, 1956a, p. 26; 1957b, p. 10. 

 Hertlein and Emerson, 1957, p. 5. 



Petrolistes marginatus, Nobili, 1901b, p. 12. 



Petrolisthes galathinus, Boone, 1931, p. 155 (part), text-fig. 9; 1932, 

 p. 45, text-fig. 13. Not P. galathinus (Bosc). 



"^Petrolisthes galathinus, Hult, 1938, p. 10. Not P. galathinus (Bosc). 



