COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 149 



Among Recent species referable to O ppenheimopecten are the eastern 

 Pacific vogdesi Arnold, galapagensis sp. nov. and hancocki sp. nov., the 

 western Pacific puncticulatus Dunker, excavatus Anton (= Pecten 

 sinensis Sowerby) and jumatus Reeve, the Indian Ocean dorothyae 

 Melvill, and the Red Sea erythraeensis Sowerby, 



Kjey to THE EASTERN PACIFIC SPECIES OF O ppenheimopecten 



1. Right valve red-brown to pale brown; left valve with intercalary 

 riblets; right valve with 19-21 ribs, left with 18-20; umbo of 



right valve strongly inflated 



vogdesi Arnold 



(Punta Eugenia, western Lower California, Mexico; Gulf of 

 California to Paita, Peru) 

 1. Right valve white; left valve without intercalary riblets; umbo 

 of right valve weakly inflated 

 2. Right valve with 16-17 ribs, left with 15-16; hinge line longer 



than vogdesi; interior white 



hancocki sp. nova 



(Cocos Island, Costa Rica) 

 2. Right valve with 15 ribs, left with 14; hinge line shorter than 

 vogdesi; interior pink or rose on auricles and along sub- 

 margins galapagensis sp. nova 



(Galapagos Islands) 



Pecten (Oppenheimopecten) vogdesi Arnold 1906 



Plate 55 



Pecten dentatus G. B. Sowerby, 1835, p. 109. "Hab. ad Sanctam 



Elenam [Santa Elena, Ecuador] . . . among sand and stones in 



twelve fathoms." 

 [non] Pecten dentatus J. de C. Sowerby, 1827, p. 143, pi. 574, fig. 1. 



"Bugbrook and Staverton, in Northamptonshire." [Fossil.] 

 [non] Pecten excavatus Anton. Valenciennes, 1846, pi. 19, fig. 1. [= 



P. vogdesi Arnold; non Pecten excavatus Anton, 1839, p. 19, no. 



710. "China."] 

 Vola dentata Sow. H. & A. Adams, 1858, p. 554. [non P. dentatus J. 



de C. Sowerby, 1827.] 

 Janira dentata Sby. Carpenter, 1864, p. 645. " = excavata, Val. Ven. 



Like media. From the Gulf fauna. Beach-20 fm. Cp." [non P. 



dentatus J. de C. Sowerby.] 



