182 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
is apparent on the middle of some of these cords. Sutures well-impressed. 
Periphery and base of the last whorl well-rounded, the latter ornamented 
by 8 rounded spiral cords similar to those between the sutures. The spaces 
between the spiral ridges on the base and between the sutures are marked 
by closely placed, exceedingly slender, raised, axial threads. Aperture 
pyriform, somewhat effuse anteriorly, posterior angle acute; columella 
short, curved, re-enforced by the attenuated base, free only at its extreme 
anterior end, with an oblique fold near its insertion; parietal wall covered 
by a thin callus. Length, 2.2; diameter, 0.9 mm. (Dali and Bartsch.) 
Type in United States National Museum; No. 107440. Type locality, 
Cumshewa Inlet, Queen Charlotte Islands, British Columbia. 
Range. Known only from type locality. 
Subgenus Evalea A. Adams, 1860 
Odostomia aleutica Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 196; PI. 22, fig. 5. 
Shell broadly conic, light green. Nuclear whorls small, deeply obliquely 
immersed in the first of the succeeding turns. Post-nuclear whorls some¬ 
what inflately rounded, with well-rounded summits. Entire surface 
marked by fine lines of growth and numerous very fine, closely spaced, 
wavy, spiral striations. Sutures strongly impressed. Periphery of the 
last whorl and base well-rounded, the latter quite strongly inflated. Aper¬ 
ture broadly ovate, somewhat effuse anteriorly, posterior angle acute; outer 
lip broadly curved, thin; columella slender, curved, and reflected, free 
from the base, forming a suggestion of an umbilicus; columella fold 
slender, situated a little below the insertion of the columella; parietal wall 
covered by a thin callus. Length, 4.4; diameter, 2.8 mm. (Dali and 
Bartsch.) 
Type in United States National Museum, No. 205179. Type locality, 
Station 3336, in Iliuliuk Harbor, Bering Sea, Alaska. 
Range. Captain’s Harbor, Unalaska, Alaska, to Amaknak Island, 
Unalaska, Alaska. 
Odostomia altina Dali and Bartsch, 1909 
Plate 60, fig. 2 
Bulletin 68, United States National Museum, 214; PI. 25, fig. 2. 
Shell ovate, white. Nuclear whorls deeply obliquely immersed in the 
first of the succeeding turns, above which only the tilted edge of the last 
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