98 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



Pecten (Argus) circularis Sow. Morch, 1861, p. 210. "Realejo et 

 Puntarenas." 



Pecten (Dentipecten) circularis Sowerby. Kobelt, 1887, p. 188, pi. 51, 

 figs. 5-8. California to Mazatlan, Mexico. 



Pecten (Plagioctenium) ventricosus Sowerby. Dall, 1898, p. 710. Pleisto- 

 cene of San Pedro, San Diego and Lower California. "Living from 

 Santa Barbara southward." 



Pecten (Plagiocteniuin) circularis Sowerby. Arnold, 1906 \ex parte], 

 p. 125, pi. 42, figs. 3-6; pi. 44, figs. 6, 6a, 6b, 7. [Fig. 7, holotype 

 of P. compactus Dall, 1898, incorrectly referred to P. circularis; 

 = Chlamys (Argopecten) circularis aequisulcata (Carpenter), 

 1864.] "Pliocene (?). Cholas Valley, near San Diego (Stearns)." 

 Previous Pleistocene records cited. "Living. Gulf of California to 

 Panama . . ." 



Pecten ventricosus Sowerby. Dall, 1909, p. 256. "Gulf of Panama, south 

 to Paita, Peru." 



Chlamys (Aequipecten) ventricosa Sowerby. Lamy, 1909, p. 213. "Basse 

 Californie." 



Pecten (Chlamys) circularis Sowerby. Dall, 1921, p. 19. "Monterey, 

 California, to Payta, Peru." [Under "Section" Plagiocteniuni.\ 



Pecten ventricosus Sowerby. Bosworth, 1922, p. 178. Pleistocene of 

 NW Peru. 



\non\ Pecten circularis Sb. Campbell, 1923, p. 40. "Near Canton 

 [China], and at Chung Chow, Hongkong territory." [non P. 

 circularis; sp. ?] 



Pecten (Plagioctenium) colli Hertlein, 1925, p. 16, pi. 4, figs, 5-7. 



Pecten circularis Sowerby. Dall & Ochsner, 1928, p. 98. Indefatigable 

 Island, Galapagos Islands. ". . . believed to be Pliocene . . ." 



Chlamys ventricosus (Sow.). Tomlin, 1928, p. 191. 



Pecten cf. circularis Sowerby. Li, 1930, p. 255, pi. 1, fig. 8. Panama 

 Bay. "Probably Gatun formation." ["Two right valves of P. 

 ventricosus Sowb.", fide Pilsbry, 1932, p. 429.] 



Pecten fililextus Li, 1930, p. 255, pi. 2, fig. 10. Panama Bay. Prob- 

 ably Gatun formation." ["A left valve of Pecten ventricosus 

 Sowb.", fide Pilsbry, 1932, p. 429. The name fililextus meaningless 

 and obviously a lapsus calami or typ. err.; correctly emended to 

 filitextus by Pilsbry, loc. cit.] 



Pecten (Aequipecten) gibbus (Linneaus) variety circularis (Sowerby). 

 Grant & Gale, 1931 [ex parte], p. 218, pi. 5, figs. 7a-7c. [Specimen 

 figured = Chlamys (Argopecten) circularis aequisulcata (Car- 

 penter).] 



