WEST AMERICAN PYRAMIDELLTD MOLLUSKS. 221 



ODOSTOMIA (AMAURA) SATURA Carpenter. 



Plate 27, fig. 1. 



Odostomia satura Carpenter, Ann. Mag. Nat. Hist., 3d ser., vol. 15, 1865, p. 29. 

 +var. pupiformis Carpenter, Ann. Mag. Nat. Hist., 3d ser., vol. 15, 1865, 

 p. 29. =Odostomia (Amaura) satura (Carpenter) Dall and Bartsch, Proc. 

 U. S. Nat. Mus., vol. 33, 1907, pp. 529-530, pi. 48, figs. 5, 5a. 



Shell of medium size, broadly conic, white. Nuclear whorls at least 

 two, forming a de]:)ressed spire, the axis of which is almost at a right 

 angle to the axis of the later whorls, and which is deeply, somewhat 

 obliquely immersed in the first post-nuclear turn. Post-nuclear whorls 

 moderately well rounded, faintly shouldered at the summit, marked 

 all over by irregular rough, low, tumescenses, which simulate obso- 

 lete vertical ribs. Sutures simple, well marked. Periphery of the 

 last whorl well rounded. Base quite short, decidedly rounded, and 

 umbilicated. Umbilicus partly covered by the revolute columella. 

 Aperture large, very broadly oval, somewhat effuse anteriorly; pos- 

 terior angle obtuse; outer lip thick; columella moderatel}'^ strong, 

 oblique, decidedly curved, with a decided oblique fold, situated con- 

 siderably anterior to its insertion; parietal wall covered by a fairly 

 thick callus. 



The type (Cat. no. 15520, U.S.N.M.) was collected by J. G. Swan 

 at Neah Bay, Washington. It has five and one-half whorls which 

 measure: Length 6.4 mm., diameter 3.5 mm. 



The specimen upon which Doctor Carpenter fixed the name pupi- 

 formis (Cat. no. 15520a, U.S.N.M.), cohected by J. G. Swan at Neah 

 Bay, Washington, is not worthy of a varietal name. It is a freak, 

 having the spire less elevated, which is, perhaps, due to some injury 

 received at an early date, evidence of which seems present. It agrees 

 perfectly in every detail with the type of satura excepting the shape 

 of the spire. 



ODOSTOMIA (AMAURA) FARALLONENSIS, new species. 



Plate 27, fig. 7. 



Shell very elongate-ovate, deeply umbilicated, light yellow. Nu- 

 clear whorls very deeply immersed. Post-nuclear whorls very 

 slightly rounded in the middle between the sutures, more strongly so 

 near the anterior end and toward the summit. Summit strongly 

 narrowly tabulate. Periphery of the last whorl inflated. Base very 

 strongly suddenly rounded, widely and deeply umbilicated. Entire 

 surface marked by numerous fuie, closely spaced, spiral striations. 

 Aperture broadly ovate, posterior angle obtuse, outer lip thin; colu- 

 mella very slender, strongly curved, revolute, provided with a deep 

 fold a little below its insertion; parietal wall glazed with a thin 

 callus. 



