196 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
from the next pair, and a very narrow but sharp groove between the two 
threads composing the pair; transverse sculpture only of fine incremental 
lines; nucleus lost; aperture snow-white within; not lirate, though the 
external sculpture is reflected slightly close to the edge of the outer lip, 
which is slightly expanded; canal very short and wide; whorls six and one- 
half without the nucleus; operculum normal, very large, closing the aper¬ 
ture. Length of shell, 124; whorl, 80; max. diam., 55 mm. (Dali.) 
Type in United States National Museum, No. 106988. Type locality, 
Station 3497, in Bering Sea, near the Pribilof Islands. 
Range. Pribilof Islands, Bering Sea. 
Beringius aleuticus Dali, 1894 
Plate 25, fig. 2 
Proceedings of the United States National Museum, 17:711; PI. 29, fig. 2. 
Shell of about five whorls (the nucleus is lost), solid, heavy, smooth, 
except for faint incremental lines and occasional obscure spiral streaks; 
whorls rounded, covered with a yellow-brown epidermis above the suture; 
the part anterior to the sutural line on the last whorl is marked by paler, 
opaque straw color; suture deep, not channeled; the pillar heavy, white, 
short; the siphonal fasciole, if any, removed by erosion; canal hardly 
differentiated from the aperture; pillar lip white, callous; outer lip smooth, 
simple, slightly expanded. Length of decollate shell, 65; of last whorl, 
48; max. diameter, 36 mm. (Dali.) 
Type in United States National Museum, No. 106999. Type locality, 
Station 3481, near Amukhta Pass, Aleutian Islands. 
Range. Amukhta Pass, Aleutian Islands, in 248 fathoms. 
Beringius marshalli Dali, 1919 
Plate 16, fig. 8 
Proceedings of the United States National Museum, 56:311. Bulletin 112, United 
States National Museum; PI. 9, fig. 3. 
Shell large and thin livid flesh color, with a dehiscent, thin, pale 
brownish periostracum; suture distinct, constricted, the whorl slightly 
flattened in front of it; spire attenuate with seven whorls exclusive of 
the (lost) nucleus, the apical whorls feebly irregularly axially plicate, 
the others with only rather conspicuous silky incremental lines; at the 
shoulder on the last whorl are developed low oblique irregular ridges with 
wider interspaces; a few also appear near the periphery; on the base 
there are about eight low obscure ridges with wider interspaces; aperture 
ovate, pinkish brown within, outer lip thin, body and pillar with a layer 
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