274 Bulletin Vanderbilt Marine Museum, Vol. VII 



(Schmitt) ; Galapagos Islands, at "Arcturus" station 54, Hood 

 Island (Boone). As eriomerus: Mendocino County, California 

 (Stimpson) ; Humboldt County to San Francisco Bay, California 

 (Holmes) ; California coast (Lockington) ; north shore of Tabo- 

 gilla Island, Bay of Panama and Gardner Bay, Hood Island, Gala- 

 pagos Islands, 2.5 fathoms (Boone) . As valida: Valparaiso, Chile 

 (Dana) ; Valparaiso Beach, Chile and Messier Channel, South 

 America (Henderson). 



Material examined: Eight specimens, taken on the shore 

 of Clotilde Island, Chiloe Archipelago, Chile, February 12, 1935, 

 by the "Alva." 



Discussion: Examination of the eight little Porcellanid 

 crabs from the Chiloe Archipelago directed attention to the long 

 neglected report of M. Guerin de Meneville on the "Crv^taces du 

 Voyage de la Favorite" (1835, also 1838), and the fact that the 

 present specimens of the Vanderbilt South American Expedition 

 of 1935 are identical with M. Guerin de Meneville's (1835) type 

 of PorcelUma granulosa from Valparaiso, as figured by him a 

 hundred years ago, which automatically has priority over Dr. 

 Henri Milne Edwards' PorceUana striata (1837) based on the de 

 Meneville types. This led to a review of Mr. J. W, Randall's 

 PorceUana cinctipes (1839) , described from the Hawaiian Islands, 

 with which species PorceUana rupicola Stimpson (1857) from the 

 littoral zone of the California coast at the Farallones, San Luis 

 Obispo and Monterey, has long been accepted as synonymous. 



Likewise, Petrolisthes eriomerus Stimpson (1871), taken by 

 Mr. Alexander Agassiz, in Mendocino County, California, and 

 first illustrated by Mr. S. J. Holmes (1900), who gave a figure 

 of the chelipeds only, based on additional specimens taken in 

 California, from Humboldt County to San Francisco and Mendo- 

 cino, appears to be only a variety of granulosa. As pointed out 

 by Mr. Stimpson (1857), his species P. rupicola has its affinities 

 with Petrolisthes valida, P. violacea and P. granulosa, from 

 which he distinguishes rupicola by the smooth anterior margin 

 of its carapace. As stated by Mr. Lockington (1878), P. erio- 

 merus. is but a variety of the earlier described P. rupicola Stimp- 

 son; Mr. Lockington's statement being based upon examination 

 of a series of specimens from California which showed the inter- 

 grading of the alleged specific characters of P. eriomerus with 

 P. rupicola. 



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