CLASS GASTROPODA 
189 
Type, one in Geological Survey Museum, the other in United States 
National Museum, No. 220120. Type locality, Skidegate, Queen Charlotte 
Islands, British Columbia. 
Range. Known only from type locality. 
Odostomia clessini Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 211; Pi. 24, fig. 4. 
Shell elongate-ovate, rather thick, yellowish-white. Nuclear whorls 
small, very obliquely immersed in the first of the succeeding turns, above 
which the edge of only about two-thirds of the last nuclear whorl 
projects. Post-nuclear turns very high between the sutures, moderately 
rounded, marked by lines of growth and fine, irregular and irregularly 
distributed, incised, spiral lines. Suture well-impressed. Periphery and 
base of the last whorl well-rounded, marked like the spaces between the 
sutures. Aperture pear-shaped, posterior angle acute; outer lip rather thick 
within, thin at the edge; columella short, stout, curved, reflected, re¬ 
enforced by the base and provided with a strong oblique fold at its 
insertion; parietal wall covered by a thin callus. Length, 6; diameter, 
2.9 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 204014. Type locality, 
Bear Bay, Peril Straits, Baranoff Island, Alaska. 
Range. Baranoff and Admiralty Islands, Alaska. 
Odostomia columbiana Dali and Bartsch, 1907 
Plate 63, fig. 1; Plate 66, fig. 9 
Proceedings of the United States National Museum, 33:525; PI. 47, fig. 9. 
Shell large, elongate-conic, white. Nuclear whorls small, vitreous, 
planorboid, deeply obliquely immersed in the first of the succeeding turns, 
above which only the tilted edge of the last volution is visible. Post- 
nuclear whorls increasing regularly in size, well-rounded, very narrowly 
roundly shouldered at the summits, which renders the sutures well-marked. 
Periphery of the last whorl somewhat inflated. Base well-rounded, 
attenuated anteriorly to re-enforce the columella. Entire surface covered 
by numerous, somewhat wavy, subequal and subequally closely placed, 
spiral lirations, of which about 40 occur between the summit and the 
periphery and about an equal number on the base of the last whorl. 
Aperture large, decidedly patulous anteriorly; posterior angle acute; outer 
lip thin at the edge, very thick within; columella curved and strongly 
reflected, free only at its anterior extremity, provided with a strong oblique 
fold at its insertion. Length, 8.3; diameter, 4.2 mm. (Dali and Bartsch.) 
[487] 
