CLASS GASTROPODA 
191 
Odostomia deliciosa Dali and Bartsch, 1907 
Plate 60, fig. 5; Plate 66, fig. 5 
Proceedings of the United States National Museum, 33:525; PI. 47, fig. 5. 
Shell small, elongate-conic, translucent to milk-white. Nuclear whorls 
small, deeply immersed in the first of the succeeding turns, above which 
only a portion of the last turn is visible. Post-nuclear whorls moderately 
rounded, very weakly roundly shouldered at the summit, separated by a 
strongly marked suture; a narrow band appears about the summit showing 
its junction with the preceding turn. Periphery and base of the last 
whorl inflated and well-rounded. Entire surface of base and spire 
marked by very fine lines of growth and numerous microscopic wavy 
spiral striations. Aperture rather large, somewhat effuse anteriorly; 
posterior angle acute; outer lip thin; columella rather stout, strongly 
curved, and revolute, re-enforced by the attenuated base, and covered 
with a strong fold at its insertion. This fold can be seen through the 
transparent shell as a quite strong lamella on the pillar of the turns. 
Length, 4; diameter, 1.9 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 46492. Type locality, 
Monterey, California. 
Range. Barkley Sound, Vancouver Island, to Monterey, California. 
Odostomia donilla Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 208; Pi. 24, fig. 3. 
Shell broadly conic, bluish-white. Nuclear whorls deeply obliquely 
immersed in the first of the succeeding turns, above which only the tilted 
edge of the last volution projects. Post-nuclear whorls well-rounded, 
slightly contracted at the suture, appressed at the summit. Periphery of 
the last whorl angulated. Base slightly rounded, sloping abruptly from 
the periphery to the umbilical area. Suture slightly impressed. Entire 
surface of base and spire marked by numerous almost vertical lines of 
growth and many well-incised spiral striations. Aperture ovate, slightly 
effuse anteriorly; posterior angle acute; outer lip thin; columella strongly 
curved, reflected, re-enforced by the base, provided with a strong fold at 
its insertion. Length, 4.5; diameter, 2.2 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 126626. Type locality, 
San Pedro, California. 
Range. San Pedro, California, to Todos Santos Bay, Lower Cali¬ 
fornia. 
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