CLASS GASTROPODA 
157 
oval, decidedly effuse anteriorly; posterior angle acute; outer lip ren¬ 
dered sinuous by the spiral cords, thin, showing the external sculpture 
within; columella slender, very long, almost straight, reflected, re-enforced 
by the base, provided with a weak fold at its insertion. Length, 3; 
diameter, 1.5 mm. (Bartsch.) 
Type in United States National Museum, No. 15730. Type locality, 
Santa Barbara, California. 
Range. Santa Barbara to Pacific Beach, California. 
Described as Chrysallida cincta. 
Odostomia Clementina Dali and Bartsch, 1909 
Plate 58, figs. 5, 5 a 
Bulletin 68, United States National Museum, 149; PI. 15, figs. 5, 5a. 
Shell elongate-conic, vitreous. Nuclear whorls obliquely immersed in 
the first post-nuclear turn, above which only the tilted edge of the last 
volution projects, which is marked by five slender spiral threads. Post- 
nuclear whorls well-rounded, moderately contracted at the sutures, strongly 
slopingly shouldered at the summit, marked by strong, somewhat retractive 
axial ribs, of which fourteen occur upon the first and second, eighteen 
upon the third and penultimate turn. In addition to the axial ribs, the 
whorls are marked by four spiral cords between the sutures, of which the 
second one anterior to the summit marks the angle of the shoulder. On 
the last two whorls the first basal is apparent in the strongly contracted 
sutures. Periphery of the last whorl marked by a spiral groove. Base 
well-rounded, somewhat attenuated anteriorly, marked by five distant 
spiral cords, which grow successively weaker from the periphery to the 
umbilical region. The broad spaces that separate these cords are marked 
by numerous, fine, raised, axial threads. Aperture broadly oval; posterior 
edge obtuse; outer lip thin, showing the external sculpture within, rendered 
sinuous by the spiral cords; columella moderately strong, slightly reflected, 
re-enforced by the base, provided with a slender fold at its insertion. 
Length, 2.3; diameter, 1.1 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 162043. Type locality, 
San Clemente Island, California. 
Range. Known only from type locality. 
Odostomia dicella Bartsch, 1912 
Proceedings of the United States National Museum, 42:274; PI. 36, fig. 1. 
Shell small, elongate-ovate, somewhat translucent, bluish-white. 
Nuclear whorls small, very obliquely immersed in the first of the suc¬ 
ceeding turns. Post-nuclear whorls well-rounded, marked by four spiral 
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