NO. 1903. WEST AMERICAN PYRAMIDELLID M0LLVSKS—BART8CFI. 287 



ODOSTOMIA (AMAURA) GRIPPIANA, new species. 

 Plate 38, fig. 11. 



Shell large, umbilicated, yello\\Tish-white. Nuclear whorls decol- 

 lated. Post-nuclear whorls decidedly, slopingly, tabulatedly shoul- 

 dered at the summit, otherwise moderately rounded; marked by fine 

 incremental lines and numerous, equal and equally spaced, slender, 

 wavy, spiral threads, of which 6 occur upon the shoulder, and about 

 40 between the shoulder and the suture. Periphery and the moder- 

 ately long base of the last whorl well rounded, marked like the spire. 

 Aperture moderately large, ear-shaped; posterior angle obtuse; 

 inner lip moderately long, stout, curved, somewhat reflected, pro- 

 vided with a strong fold a little anterior to its insertion; parietal wall 

 glazed with a thin callus. 



The type (Cat. No. 211559, U.S.N.M.) was collected by Mr. Gripp 

 at Nanaimo, British Columbia. It has 6 post-nuclear whorls and 

 measures: Length, 7.5 mm.; diameter, 0.4 mm. The fine spiral lira- 

 tions differentiate this form from all other umbilicate Amauras. 



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



ODOSTOMIA (AMAURA) ELDORANA, new species. 



Plate 38, fig. 12. 



Shell elongate, conic, wax-yellow. (Nuclear whorls decollated.) 

 Post-nuclear whorls moderately well rounded, slightly constricted at 

 the sutures, feebly roundly shouldered at the summit, marked \vith 

 lines of growth and very fine spiral striations. Periphery of the last 

 whorl well rounded. Base slightly protracted, well rounded, very 

 narrowly ^umbilicated. Aperture elongate ovate; posterior angle 

 acute; outer lip thin at the edge; inner lip very oblique, somewhat 

 sinuous, reflected over and adnate to the base, provided mth a mod- 

 erately strong fold, a little anterior to its insertion; parietal wall 

 closed by a very thin callus. 



The type and another individual (Cat. No. 34246, U.S.N.M.) were 

 collected at Kadiak Island, Alaska. The type has the last 4^ whorls 

 remaining, which measure: Length, 9 mm.; diameter, 4 mm. 



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



ODOSTOMIA (SCALENOSTOMA) BABYLONIA, new species. 

 Plate 38, fig. ;^. 

 Shell elongate-conic, light yellowdsh-brown, excepting the umbilical 

 area, the extreme basal portion and the tip, which are white. Nuclear 

 whorls very smaU. Post-nuclear whorls flattened, separated by a 

 scarcely impressed suture. On the last three turns the whorls are 

 marked at the periphery by an exceedingly strong, acute, spiral keel, 

 wliich is slightly bent downward. Base of the last whorl short, well 

 rounded. Entire surface of spire and base smooth, except for exceed- 

 ingly fine, incremental lines. Aperture oval; posterior angle acute; 

 outer lip rendered }-shaped by the spiral keel; inner lip slender, 

 evenly curved, very slightly revolute; parietal wall glazed with a 

 thin callus. 



