140 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



man translation by Gadebusch, published in 1762, does not give 

 validity to the names published in the original edition in 1757." 



"Not only is Pec ten Osbeck inadmissible on this basis, but it 

 would also appear to be a nomen nudum. The genus is in no way 

 described, but is solely dependent on its association with the specific 

 name Adscensionis. This species, however, is certainly not indicated 

 or defined, and surely one cannot regard this casual allusion as a 

 description. It is so far from being described that Grant and Gale 

 interpret it as an unidentified species of Chlamys, while I should 

 consider it more probable that it was Spondylus powelli Smith, after 

 consulting published and manuscript lists of Ascension Island mol- 

 lusca and bearing in mind the remark, firmly grown (fastwaxt) 

 on coral ; though an unknown species of Chama might be a better 

 guess. This point could be settled from the actual specimen, which 

 is probably still in existence, but "in no case is the word indication 

 to be construed as including museum specimens." [Opinion 1.] 



"My conclusion is that Pecten Osbeck is a nude name, published 

 in a work not valid for nomenclature ; accordingly Pcctcn Miiller 

 1776 stands with P. inaxiinus (L.) as type." 



Von Teppner's Philippia is a junior homonym, but even if that were 

 not so its status would be that of a synonym for Pecten, for it was 

 actually intended to replace this genus. Deperetia, Heritschia and 

 Jaworskia, proposed as subgenera of Philippia, must also be synonymized ; 

 furthermore, their types are clearly referable to Pecten. 



In his paper. The Genus Pecten in the West Pacific (1950, p. 277), 

 Fleming said : "The West Pacific species for which the name Notovola 

 Finlay, 1927, was proposed, are too close to European species to warrant 

 even subgeneric separation, . . ." In a subsequent paper (1951, p. 128), 

 he said, ". . . Notovola Finlay, . . . has no phylogenetic unity .... 

 P. novaezealandiae has fossil relations (tainui Fin., toi Fleming) linking 

 it with the Mediterranean jacobaeus L., which students of the Pectinidae 

 agree to be closely akin to maximus L., . . ." 



Key to the eastern Pacific species of Pecten 



1. Shell nearly orbicular; ribs of right valve rounded and sloping; 

 interspaces quite wide, particularly on left valve; concentric 



lamellae on each valve extremely fine 



sericeus Hinds 



(Galapagos Islands; Ecuador to northern Gulf of California) 



