COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 1 19 



Pecten (Chlamys) humbezensis Orbigny. Dall, 1921, p. 19. Santa 



Barbara, California, to Peru. [Under "Section" Leptopecten. See 



paragraph 2 of Remarks under C. latiaurata (Conrad), this paper.] 



Pecten tumbezensis d'Orbigny. Bosworth, 1922, p. 178. Pleistocene of 



NW Peru. 

 Chlamys sower by t (Reeve). Tomlin, 1928, p. 191. 



Pecten cf. latiauritus fucicolus Dall. Li, 1930, p. 255, pi. 2, fig. 11. 

 "Mouth of the Rio Grande near La Boca about one mile from 

 mainland in Panama Bay. Recent." [= Pecten tumbezensis 

 d'Orbigny, fide Pilsbry, 1932, p. 429.] 

 Pecten latiauritus Conrad indentus Li, 1930, p. 256, pi. 2, fig. 13. 

 [Same data as above; ^ Pecten tumbezensis d'Orbigny, fide Pils- 

 bry, 1932, p. 429.] 

 Pecten latiauritus Conrad splendens Li, 1930, p. 256, pi. 2, fig, 12. 

 [Same data as above; == Pecten tumbezensis d'Orbigny, fide Pils- 

 bry, 1932, p. 429.] 

 Pecten (Aequipecten) tumbezensis d'Orbigny. Grant & Gale, 1931, p. 

 206. "Gulf of California to Peru ; ?Santa Barbara, California." 

 [In synonymy: ^'Pecten (Aequipecten) palmeri Dall," Arnold, 

 . . . , 1906." See reference in synonymy of Chlamys (Leptopecten) 

 palmeri (Dall), this paper.] 

 Pecten (Leptopecten) tumbezensis d'Orbigny. Hertlein, 1935, p. 314, 

 pi. 19, figs. 11, 12. Gulf of California to Tumbez and Paita, Peru. 

 Chla?nys tumbeziensis [sic] d'Orbigny. Bavay, 1936, p. 307. 

 Aequipecten (Leptopecten) tumbezensis (Orbigny, 1846). Keen, 1958, 

 p. 70, fig. 129. 

 Holotype: ? 



Type locality : Tumbez, Peru. 



Original description : Pect. testa suborbiculari, depressiuscula, sub- 

 aequivalvi, aequilaterali, auriculis inaequalibus, dextra majuscula ; val- 

 varum altera radiatim costata, pallescente seu alba, costis quatuordecim 

 majoribus, rotundatis, laevibus, altera radiatim costata, costis quindecim 

 acutioribus, fuscis, punctulis caerulescentibus aspersis, interstitiis tenuis- 

 sime transversim striatis, pallescentibus ; long. 1.4, lat. 0.5, alt. 1.3 poll. 

 Additional description: Shell of moderate size, adult specimens 

 averaging 32 mm in height. Both valves moderately convex; left one 

 slightly shallower and often depressed between umbo and ventral mar- 

 gin. Beak closer to anterior of shell, resulting in anterior auricles and 

 submargins of shorter length than posterior. Right valve with 14 or 15 

 rounded ribs and interspaces of same width ; interspaces having fine 



