286 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



Two specimens, cotypes, of this species were dredged at Skide- 

 gate. One of these has 4 post-nuclear whorls and measures: Length, 

 2.5 mm. ; diameter, 1.3 mm. One is in the collection of the Geological 

 Survey of Canada; the other is Cat. No. 220120 in the United States 

 National Museum. 



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



ODOSTOMIA (AMAURA) SUBGLOBOSA, new species. 

 Plate 37, fig. 2. 



Shell moderately large, subglobose, mUk-white, very narrowly 

 umbOicated. Nuclear whorls small, deeply, obliquely immersed in the 

 first of the succeeding turns. Post-nuclear whorls well-rounded, nar- 

 rowly, tabulatedly shouldered at the summit; surface somewhat rough, 

 marked by weak lines of growth and spiral striations; periphery of 

 the last whorl strongly inflated ; base short, inflated, marked like the 

 spire. Aperture large, ear-shaped; posterior angle obtuse; outer 

 lip thin at the edge, thick withm; inner lip short, strong, twisted, 

 and somewhat revolute, provided with a strong fold a little anterior 

 to its insertion; parietal wall glazed with a moderately thick callus. 



Two specimens of this species were collected by Mr. F. W. Kelsey 

 at San Diego, California. One of these, the type, is in the United 

 vStates National Museum, Cat. No. 211560. It has 6 post-nuclear 

 whorls and measures: Length, 6 mm.; diameter, 4.1 mm. The other 

 is in Mr. Kelsey's collection. 



This species follows Odostomia (Amaura) heringi in the key. 



ODOSTOMIA (AMAURA) HELENA, new species. 

 Plate 38, fig. 10. 



Shell moderately large, yellowish- white, very elongate-ovate. 

 Nuclear whorls small, very obliquely immersed in the first of the suc- 

 ceeding turns, above which the tilted edge of the last volution only 

 projects. Post-nuclear whorls subtabulatedly shouldered at the sum- 

 mit, well rounded, apparently marked by incremental lines only. 

 Sutures strongly constricted. Periphery of the last whorl somewhat 

 inflated, well rounded. Base short, well rounded, broadly umbili- 

 cated, marked like the spire. Aperture moderately large, ovate; pos- 

 terior angle obtuse; outer lip evenly curved; inner lip sinuous, 

 reflected over, but not adnate to the base, provided with a strong 

 oblique fold, which is about one-third of the distance of the length of 

 the inner lip anterior to the insertion of the inner lip. Parietal wall 

 covered with a thick callus. 



The type (Cat. No. 249904, U.S.N.M.) was collected by Mrs. Bald- 

 ridge at San Pedro, California. It has 6 post-nuclear whorls, and 

 measures: Length, 5 mm.; diameter, 2.7 mm. The position of the 

 columellar fold will distinguish this species at a glance from all the 

 other California shells. 



This species follows Odostomia (Amaura) satura in the key. 



