CLASS GASTROPODA 
179 
whorl well-rounded, marked by four incised lines on the posterior two- 
thirds, which are equally spaced but grow successively weaker. The 
peripheral and first subperipheral channel are equal to those on the spire; 
all are rendered pitted by the slender axial riblets. Anterior third smooth. 
Aperture broadly oval, somewhat effuse anteriorly; posterior angle acute; 
outer lip thin; columella slender, curved, somewhat reflected and re¬ 
enforced by the base; parietal wall covered by a thin callus. Length, 2.4; 
diameter, 1.2 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 206908. Type locality, 
Catalina Island, California. 
Range. Known only from type locality. 
Odostomia fetella Dali and Bartsch, 1909 
Bulletin 68, United States National Museum, 189; PI. 21, figs. 9, 9a. 
Shell very elongate, milk-white. Nuclear whorls small, obliquely 
two-thirds immersed in the first of the succeeding turns. Post-nuclear 
whorls well-rounded, moderately contracted at the sutures and slightly 
shouldered at the summit, marked by four, strong, flattened cords, which 
grow successively a little weaker from the summit to the periphery, 
separated by narrow, deeply incised spiral grooves. Periphery of the last 
whorl marked by a broad, flat cord somewhat wider than the first supra- 
peripheral one. Base of the last whorl somewhat attenuated anteriorly, 
well-rounded, marked by eleven, equal and equally narrow, rounded, spiral 
cords. In addition to this sculpture, there are many very fine incised 
spiral lines and decidedly retractive axial lines of growth on the spire and 
base. Aperture broadly oval, slightly effuse anteriorly, posterior angle 
acute; outer lip thin, showing the external sculpture within; columella 
moderately strong, slightly curved, somewhat reflected, completely re¬ 
enforced by the base, provided with a strong fold at its insertion; parietal 
wall covered by a thin callus. Length, 4.4; diameter, 1.8 mm. (Dali and 
Bartsch.) 
Type in United States National Museum, No. 46478. Type locality, 
San Diego, California. 
Range. San Pedro, California, to San Ignacio Lagoon, Lower Cali¬ 
fornia. 
Odostomia gloriosa Bartsch, 1912 
Proceedings of the United States National Museum, 42:276; PI. 36, figs. 2, 2a. 
Shell moderately large, very elongate-ovate, with very regular, conic 
spire, bluish-white. Nuclear whorls small, obliquely immersed in the first 
of the succeeding turns, above which a portion of the last two volutions 
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