280 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



middle, rounded strongly at the summit and the suture, marked 

 by decidedl}^ sinuous, exceedingly fine lines of growth and fine spiral 

 striations; the latter are less strongly developed on the posterior 

 two-tliirds between the sutures than on the anterior third and on the 

 base. Sutures strongly constricted. Periphery of the last whorl and 

 base inflated, well rounded, the latter deeply and strongly umbili- 

 cated. Aperture oval; posterior angle acute; outer lip tliin, showing 

 the external sculpture within; inner lip very slender, strongly curved 

 and slightly revolute, provided with a very faint, obHque fold a little 

 anterior to its insertion; parietal wall glazed with a tliin callus. 



There are three specimens of this species, two of wliich are in the 

 Geological Survey Museum collection at Ottawa, and one (Cat. No. 

 211541) is in the United States National Museum. All three were 

 dredged in 18 to 28 fathoms at Ship Channel, Barkley Sound, Van- 

 couver Island, British Columbia. The specimen figured has 5 post- 

 nuclear whorls, and measures: Length, 3.8 mm.; diameter, 1,9 mm. 



This species follows Odostomia (Evalea) esilda in the key. 



ODOSTOMIA (EVALEA) VANCOUVERENSIS Dall and Bartsch. 

 Plate 37, fig. 1. 



Odostomia (Evalea) vancouverensis Dall and Bartsch, Dep. Mines, Geol. Surv., 

 Canada, 1910, pp. 18-19, pi. 2, fig. 7. 



Shell, elongate-ovate, very narrowly umbilicated, turreted, yellow- 

 ish-wliite. Nuclear whorls small, obliquely immersed in the first of 

 the succeeding turns, above which only half of the last volution pro- 

 jects and extends beyond the outline of the spire. Post-nuclear 

 whorls broadly, tabulatedly shouldered at the summit, moderately 

 rounded, marked by almost vertical lines of growth and numerous 

 exceedingly fine spiral striations. Sutures rendered very conspicuous 

 by the tabulated shoulder. Periphery of the last whorl well rounded, 

 base moderately long, well rounded, marked like the spire. Aperture 

 large, elongate-ovate, somewhat effuse anteriorly; posterior angle 

 decidedly obtuse; outer lip tliin; inner lip slender, oblique, and 

 somewhat revolute, provided with an obhque fold a little anterior to 

 its insertion; parietal wall glazed with a thin callus. 



Specimens of this species were dredged in 18 to 28 fathoms at Ship 

 Channel, Barkley Sound, Vancouver Island, British Columbia, part 

 of which are in the collection of the Geological Survey, Ottawa, and 

 others in the United States National Museum, Cat. No. 211539. The 

 specimen figured has 5 post-nuclear whorls, and measures: Length, 

 4.7 mm.; diameter, 2.2 mm. 



The strongly tabulated summit of the whorls separates this species 

 from aU the known Evaleas of the Oregonian faunal area. 



This species follows Odostomia {Evalea) spreadborongJii in the key. 



