135 
Hemphill, Nautilus 11:74. Salmon river Mts., Idaho. 
1940 Prophysaon humile 
Cockerell, Nautilus 11:79. Notes on a Ceur d’Alene example. 
1941 Sigaretus Oldroydi Dall. 
Shell large, thin, naticoid, with a short spire and 3-4 inflated 
whorls; color pale brown, livid on the spire, fading to waxen on 
the base; surface sculptured with extremely fine wavy spiral 
strie; aperture ample, oblique, outer lip thin, a little patulous, 
the body covered with a thin callus, pillar lip obliquely cut away, 
wide near the junction with the body, basal part of margin re- 
ceding; umbilicus large, pervious, its walls covered with a thin, 
silky, brown wrinkled epidermis. Alt. 35, diam. 37 mm.’’—Dall, 
Nautilus 11:85-12:85. : 
Type locality:—off Catalina Island, Cal., in deep water (Mr. 
and Mrs. T. S. Oldroyd). 
1942 Pecten Palmeri Dall, Nautilus 11:85. Gulf of Cal. (Ed- 
ward Palmer). 
1943 Pecten Davidsoni 
On the Davidson bank, Alaska, in 280 fms., green mud, and 
north of Unalashka, in Bering Sea, 351 fms., sand. 
“Shell small, suborbicular, compressed, waxen white, left valve 
with 21 rounded ribs, surmounted by (when not worn off) con- 
tinuous rows of minute subglobular scales, the interspaces wide, 
flat and perfectly smooth, ears very small, the interior with 5 or 
6 imbricated radii; sculpture obsolete near the umbones; right 
valve sculptured with faint concentric impressed lines over 
the whole surface, and distally with numerous minute, obsolete, 
fine, scaly riblets; posterior ear transversely striated, very small; 
anterior one with 4 or 5 scaly radii, a well marked sinus leaving 
an imbricated fasciole and no stenolium. Interior polished, the 
left valve fluted internally in harmony with the external ribs. 
Alt. 14, lat. 14, diam. 3.5 mm.’’—Dall, Nautilus 11:86. 
1944 Pecten Randolphi 
‘Shell small, thin, glossy, unsculptured, except by minute 
‘camptonectes’ striation which covers both valves, and more or 
less obscure concentric undulations which are most distant 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 6 
small imbricated radii above, below a wide, transversely striated 
fasciole derived from a well marked byssal sinus; cternolium with 
4 or 5 functional spines. _ Alt. 27.5, lat. 26, diam. 5 mm.’’—Dall, 
Nautilus 11:86. 
Type locality:—off Destruction Island, Wash., in 5-6 fms. 
Occurs from Bering Sea to West Mexico, in 225-1005 fms. Named 
in honor of P. B. Randolph, of Seattle, Wash. 
1945 Pilsbry, H. A. and E. G. Vannatta: 
Revision of the North American Slugs: Binneya, Hemphillia; 
Hesperarion, Prophysaon and Anadenulus. Phila ac pr 1898: 
219-261, t 9-16. Not seen. 
1946 Bifidaria Ashmuni 
Sterki, Nautilus 12:49. Arizona and N. M. 
