COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 87 



doubtedly correct. No species even remotely resembling the description 

 and figure of P, denticulatus has been reported from the western Pacific ; 

 furthermore, while Adams and Reeve believed their species to have been 

 collected during the voyage of the Samarang in that area, it has been 

 established that Captain Belcher, who was on both the Sulphur and 

 Sainarang expeditions, mixed a number of shells from both. 



Geographical range: Monterey, California, to San Diego, Cali- 

 fornia. 



Geochronological range: Pliocene, Pleistocene, Recent. 



Bathymetric range: Occasionally found in shallow water; usually 

 in 10 to 50 fathoms. 



Ecological data: Usually found on sand or shale bottoms, occa- 

 sionally mud; often associated with coralline; frequently encased in 

 sponge. 



Hancock Expeditions Collecting Stations : 

 SOUTHERN CALIFORNIA and SANTA BARBARA ISLANDS: 

 26 stations; shore to 41 fathoms, rock, sand, mud. 



Chlamys hastata hericia (Gould) 1850 

 Plate 29 



Pecten hericius Gould, 1850, p. 345. "Hab. Straits of de Fuca, Oregon" 

 [Washington]. 



Pecten (Chlamys) hericeus Gould. Dall, 1898, p. 708. Pleistocene of 

 San Diego, California. "? ^ Pecten rastellinum Val., Voy. Venus, 

 pi. 19, fig. 4, 1835." [lapsus calami, 1846. P. rastellinum Valen- 

 ciennes, 1846. = P. hastatus Sowerby, 1842.] — Arnold, 1903, p. 

 110. "Living: Straits of Fuca (Gould) ; ?Sitka to Santa Barbara 

 (Cooper). Pleistocene: San Diego (Dall) ; ?Santa Barbara to San 

 Diego (Cooper) ; San Pedro (Arnold). Pliocene: San Pedro 

 (Arnold) ; ?Santa Barbara, San Fernando, San Diego well 

 (Cooper) ; San Diego (Arnold)." 



Pecten (Chlamys) hastatus Sowerby van hericius Gould. Arnold, 1906, 

 p. 110, pi. 43, figs. 3, 3a. "Living: Puget Sound (Dall, Carpenter, 

 Button). Pleistocene (lower San Pedro formation): Deadman 

 Island, San Pedro (Arnold). Pliocene: Temescal Canyon, Santa 

 Monica Mountains, Los Angeles County (Rivers) ; Deadman 

 Island, San Pedro (Voy, Arnold) ; Pacific Beach, San Diego 

 (Hemphill, Arnold). Miocene (upper): San Lucas, Monterey 

 County (Hamlin, Arnold)." 



