44 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 23 



This species is known only from the type locality, the other Albatross 

 station (off southern Chile) mentioned by Dall, and station 2818, near 

 the Galapagos Islands (in 392 fathoms). 



Cyclopecten (Delectopecten) randolphi (Dall) 1897 



Plate 16, figs. 4-5 



Pecten Randolphi Dall, 1897, p. 86. Bering Sea to west Mexico, in 225 



to 1005 fathoms.— Dall, 1902, p. 559, pi. 40, fig. 2. 

 Pecten (Pseudainusium) randolphi Dall. Arnold, 1906, p. 138, pi. 48, 



figs. 2, 2a. "The type . . . dredged ... off Destruction Island, 



Washington, in 516 fathoms . . ." — Dall, 1921, p. 19. Bering Sea 



to Guaymas, Mexico. 

 Pecten JVhiteavesi [Dall MS.]. Orcutt, 1915, p. 183. Off San Diego, 



California, in 413 fathoms. 

 Pecten (Pseudamusium) randolphi Dall. Oldroyd, 1924a [ex parte], 



p. 59, pi. 14, figs. 5, 6. [Figures = Propeamussium (Parvamus- 



siufii) davidsoni (Dall).] 

 Pecten (Pseudamussiu?nJ pedroanus (Trask). Grant & Gale, 1931 



[ex parte], p. 236. [P. randolphi Dall in synonymy. P. randolphi 



tillamookensis Arnold incorrectly synonymized.] 

 Pecten randolphi Dall. Woodring, 1938, p. 37. "Apparently ranges 



from Bering Sea to Cape Blanco, Oregon, in deep water (225 to 



1064 fathoms)." 

 Pecten (Delectopecten) randolphi Dall. Proc. Conch. Club So. Calif., 



1944, no. 35, p. 14. 

 Holotype: U. S. National Museum. 



Type locality : Off Destruction Island, northwest Washington, in 

 516 fathoms. 



Original description: Shell small, thin, glassy, unsculptured except 

 by minute "camptonectes" striation which covers both valves, and 

 more or less obscure concentric undulations which are most distinct on 

 the right valve near the umbo, and in some specimens altogether absent ; 

 hinge straight and short, anterior ears distinct, posterior ears not defined 

 by any fold or sinus, outline suborbicular, valves compressed, especially 

 the right one; right anterior ear with six small imbricated radii above, 

 below a wide, transversely striated fasciole derived from a well-marked 

 byssal sinus; ctenolium with four or five functional spines. Length, 27.5 ; 

 height, 26 ; diameter, 5 mm. 



Remarks \ This species differs from other eastern Pacific Delecto- 

 pectens in the absence of any sculpture (except on the anterior auricle 



