CLASS GASTROPODA 
187 
the narrow base, and provided with a strong deep-seated fold at its inser¬ 
tion. Length, 3; diameter, 1.5 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206916. Type locality, 
Ocean Beach, California. 
Range. San Diego, California, to Coronado Islands. 
Odostomia callimene Bartsch, 1912 
Proceedings of the United States National Museum, 42: 281; PI. 38, figs. 2, 2a. 
Shell elongate-ovate, milk-white. Nuclear whorls small, obliquely im¬ 
mersed in the first of the succeeding turns, above which only half of the 
last volution projects, the projecting portion extending considerably beyond 
the outline of the post-nuclear spire. Post-nuclear whorls slightly rounded, 
somewhat constricted at the summit, marked by almost vertical lines of 
growth and very regular, closely spaced, wavy, spiral striations; of the 
latter about 25 occur between the sutures and the third whorl. Periphery 
of the last whorl decidedly inflated, strongly rounded; base moderately 
long, well-rounded, with a narrow umbilicus, marked like the spire. 
Sutures moderately impressed. Aperture large, slightly effuse anteriorly; 
posterior angle acute; outer lip very thin; inner lip quite long, decidedly 
flexuose and somewhat reflected, provided with a strong fold opposite the 
umbilical chink; parietal wall glazed with a thin callus. Length, 3.1; 
diameter, 1.6 mm. (Bartsch.) 
Type in United States National Museum, No. 211555. Type locality, 
off San Pedro, California. 
Range. Known only from type locality. 
Odostomia calliope Bartsch, 1912 
Proceedings of the United States National Museum, 42 :278; PI. 36, figs. 10, 10a. 
Shell elongate-ovate, turreted, narrowly umbilicated, creamy-white. 
Nuclear whorls small, obliquely immersed in the first of the succeeding 
turns, above which only the tilted edge of the last volution projects. Post- 
nuclear whorls rather high between the sutures, decidedly, tabulatedly 
shouldered at the summit, almost flattened below the shoulder, the spaces 
between the shoulders and the suture appearing as cylindrical elements. 
The whorls are marked by rather strong, incremental lines and by 
numerous, strong, wavy, incised, spiral striations. Periphery and the 
moderately long base of the last whorl well-rounded, marked like the spire. 
Aperture large, oval; posterior angle decidedly obtuse; outer lip thin; inner 
lip moderately strong, oblique, somewhat sinuous, slightly reflected, and 
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