CLASS GASTROPODA 
213 
base of the last whorl well-rounded, the latter somewhat elongated. 
Aperture large, ovate, somewhat effuse anteriorly, milk-white within; 
columella short, curved; re-enforced partly by the attenuated base, having 
a strong oblique fold at its insertion; parietal wall covered by a moderately 
strong callus. (Bartsch.) 
Type in United States National Museum, No. 15517b. Type locality, 
Neah Bay, Washington. 
Range. Known only from type locality. 
Odostomia beringi Dali, 1871 
American Journal of Conchology, 7:117. Bulletin 68, United States National Museum; 
PI. 27, fig. 8. 
Shell small, white, thin, short, broad, and pointed. Whorls five, flat¬ 
tened toward the apex. Suture not impressed. Surface smooth or marked 
with faint lines of growth. Aperture less than half as long as the shell; 
rounded in front, sharply angulated at the suture. Peristome thin. Colum- 
ellar fold distinct, close to the body whorl. A deep groove behind the 
inner lip extends into a distinct tubular umbilical perforation, which is 
not encroached upon by the inner lip. Long., .22; lat., .13 in. (Dali.) 
Type in United States National Museum, No. 169456. Type locality, 
St. Michael, Norton Sound, Alaska. 
Range. Known only from type locality. 
Odostomia canfieldi Dali, 1908 
Plate 64, fig. 2 
Nautilus, 31:131. Bulletin 68, United States National Museum; PL 28, fig. 2, 1909. 
Shell large, similar in form to O. (A) avellana; white, shining. 
Nuclear whorls 3, helicoid, quite elevated, deeply immersed in the first 
of the succeeding whorls, having their axis at a right angle to the axis 
of the latter whorls. Post-nuclear whorls well-rounded, with a beveled 
shoulder at the summits. Suture well-marked, simple. Periphery and 
base of the last whorl well-rounded and inflated, the latter somewhat elon¬ 
gated. Aperture subovate, somewhat effuse anteriorly; posterior angle 
acute; outer lip thin at the edge, thick within; columella curved and 
somewhat revolute, having a prominent oblique fold near its insertion; 
parietal wall covered by a thin callus. Length, 9.6; diameter, 5.1 mm. 
(Dali.) 
Type in United States National Museum, No. 46473. Type locality, 
Monterey, California. 
Range. Barkley Sound, British Columbia, to San Diego, California. 
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