220 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



the latter whorls. Post-nuclear whorls very wide, inflated, well 

 rounded, faintly shouldered at the summit. Suture well marked, 

 simple. Periphery and base of the last whorl inflated, well rounded, 

 the latter decidedly contracted and narrowly umbilicated. Aperture 

 large, suboval, somewhat effuse anteriorly; posterior angle obtuse; 

 outer lip thin; columella straight, obliquely inserted, revolute, not 

 reenforced by the base, with an oblique weak fold near its insertion; 

 parietal wall apparently without a callus. 



The type (Cat. no. 150564, U.S.N.M.) was collected by Rev. G. W. 

 Taylor at Nanaimo, British Columbia. It has six post-nuclear whorls 

 which measure: Length 10.2 mm., diameter 6 mm. 



Two other specimens (Cat. no. 44936, U.S.N.M.) were collected by 

 Doctor Kennerley at Puget Sound, Washington, and another (Cat. 

 no. 129121) by Prof. O. B. Johnson, at Seattle, Wasliington. 



ODOSTOMIA (AM AURA) ELSA, new species. 

 Plate 29, fig. 1. 



Shell ovate, umbilicated, yellowish white. Nuclear whorls very 

 small, deeply immersed in the first of the succeeding turns. Post- 

 nuclear whorls well roimded, wnth strongly concave summits, form- 

 ing deeply channeled sutures, marked by slightly retractive lines 

 of growth, and exceedingly fine, closely placed, wavy spiral stria- 

 tions. Periphery of the last whorl well rounded. Base short, 

 inflated, moderately umbilicated, marked like the spire. Aperture 

 ovate, posterior angle obtuse; columella curved, slightly reflected, 

 not reenforced by the base, provided with an oblique fold some little 

 distance anterior to its insertion; parietal wall covered by a thin 

 callus. 



The type (Cat. no. 55811, U.S.N.M.) was collected by W. J. Fisher 

 at Kadiak Island, Alaska. It has six post-nuclear whorls, and meas- 

 ures: Length 6.1 mm., diameter 3.6 mm. 



ODOSTOMIA (AMAURA) BERING! Dall. 



Plate 27, fig. 8. 

 Odostomia beringi Dall, Am. Journ. Conch., vol. 7, 1872, p. 117. 



Shell ovate, umbilicated, bluish white. Nuclear whorls small, 

 oblicpiely immersed in the first of the succeeding turns. Post-nuclear 

 whorls moderately rounded, slightly shouldered at the summits, 

 marked by retractive lines of growth. Periphery of the last whorl 

 well rounded. Base short, strongly umbilicated. Aperture oval; 

 posterior angle obtuse, outer lip thin; columella strong, sinuous, 

 decidedly reflected, provided with a strong fold a little below its 

 insertion. Parietal wall glazed by a callus. 



The type (Cat. no. 169456, U.S.N.M.) was collected by Doctor Dall 

 at vSt. Michael, Norton Sound, Alaska. It has five post-nuclear 

 whorls, and measures: Length 5.7 mm., diameter 2.8 mm. 



