COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 107 



finely granular, with traces of pubescence, latter thicker along outer 

 margin where it extends onto ventral surface. Fingers finely granular as 

 in manus; gape with a thick tuft of pubescence. 



Walking legs finely granular or punctate. Merus not armed with 

 spines, that of leg 3 not inflated; carpus with a low longitudinal crest 

 on dorsal surface; all segments with scattered long setae. 



Material examined: See Table 32. 



Measurements: Males, 2.0 to 5.9 mm; non-ovigerous females, 2.3 

 to 6.0 mm; ovigerous females, 2.9 to 6.0 mm. An ovigerous female 

 from the type series was reported to be 5.0 mm in length, 4.5 mm in 

 breadth. 



Color: No color or trace of a pattern remained on any of the speci- 

 mens examined. A note in the container with specimens from Velero 

 III station 24-33 stated: "Some selected specimens with color notes 

 in separate vials." This material was not located ; the specimens with 

 color notes may have been other crustacean species from the same sta- 

 tion. 



Ecology: Velero III collectors took this species in the intertidal 

 zone under stones in all but three instances. It was twice found associ- 

 ated with coral, and once dredged from a sand bottom in 4-10 fathoms. 



Ovigerous females have been collected in every month from De- 

 cember through March, and in September. 



Remarks: Through the courtesy of Nils Knaben, Universitetets 

 Zoologisk Museum, Oslo, the writer was able to examine most of 

 the type series. Petrolisthes brachycarpus is a valid species, more 

 closely related to P. sch??iitti Glassell and P. platymerus, new spe- 

 cies, than to P. gracilis Stimpson. It occurs throughout the Galapagos 

 Archipelago. 



With the exception of three specimens taken at Bahia Honda, 

 Panama, the species is known only from the Galapagos Islands. In 

 view of the lack of additional material from among extensive mainland 

 collections, it is believed that the Bahia Honda record is probably 

 due either to an error in recording the locality or to accidental intro- 

 duction. 



Range: Galapagos Islands. Extralimital: Bahia Honda, Panama. 



