118 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



Chlamys (Leptopecten) tumbezensis (d'Orbigny) 1846 



Plate 40 



Pecten aspersus Sowerby, 1835, p. 110. "Hab. ad Tumbez, Peruviae." 



[non] Pecten aspersus Lamarck, 1819, p. 167. "Habite . . ." [^ P. 

 septemradiatus Miiller, 1776, p. 248.] 



Pecten Tumbezensis d'Orbigny, 1846, p. 663. "Tumbez, Peru (Cum- 

 ing)." New name for P. aspersus Sowerby, non P. aspersus 

 Lamarck. 



Pecten Sowerbyi Reeve, 1852, sp. 4, pi. 1, fig. 4. "Tumbez, Peru." 

 New name for P. aspersus Sowerby, non P. aspersus Lamarck. 



[non] Pecten Sowerbii Guilding [MS, 1826]. Sowerby, 1842, p. 53, pi. 

 12, fig. 17. ". . . from St. Vincents." [West Indies; = Ostrea gibba 

 Linne, 1758, p. 698.] 



Pecten paucicostatus Carpenter, 1864, p. 536. [Notnen nudum.] "Of 

 these forms . . . the diagnoses are written, and will probably be 

 found in one of the scientific periodicals for 1864." Footnote: 

 "presumed . . . from the neighbourhood of Sta. Barbara." — Car- 

 penter, 1864, p. 614. [Nomen nudum.] "Sta. Barbara Is. Described 

 from Col. Jewett's valves." 



Pecten paucicostatus ? n. s. Carpenter, 1864, p. 645. "Somewhat re- 

 sembling very young caurinus; but ribs fewer, stronger." [First 

 validation of name, although comparison with caurinus misleading. 

 Two syntypes in U. S. National Museum labelled by Carpenter 

 "Types Sta. Barbara Jewett Cooper Catalina Id.", and two syn- 

 types in Redpath Museum labelled by Carpenter "Type Sta. Bar- 

 bara Jewett (? Nicaragua).", fide Palmer, 1958, p. 72. See Re- 

 marks under Pecten ( ?var. ) squarrosus Carpenter, this paper, 

 concerning Jewett's localities.] 



Pecten paucicostatus Carpenter, 1865, p. 179. [Complete description.] 



Pecten (Plagioctenium) paucicostatus Carpenter. Arnold, 1906 [ex 

 parte], p. 137, pi. 39, figs. 3, 3a, 4. "Gulf of California." [Figures 

 = C. tumbezensis (d'Orbigny).] 



Pecten (Chlamys) paucicostatus Carpenter. Dall, 1921, p. 19. Catalina 

 Island, California, to Gulf of California. — Oldroyd, 1924a [ex 

 parte], p. 56, pi. 41, figs. 4, 5. Santa Barbara to Gulf of California. 

 [Figures = C. tumbezensis (d'Orbigny).] 



\non] Pecten (Chlamys) prototranquebaricus paucicostatus Vredenburg, 

 1928, p. 433, pi. 15, fig. 14; == P. prototranquebaricus noetlingi 

 Hertlein, 1936, p. 54. 



