WEST AMERICAN PYRAMIDELLID MOLLUSKS. 201 



outer lip thin: coluniella slemler; very strongly curved and reflected, 

 not reenforced by the base; parietal wall covered by a thin callus. 



The type,, Cat. no. 159464&, U.S.N.M., was collected in 25 fath- 

 oms, on sand bottom, in Captains Harbor, Unalaska, Alaska, by Dr. 

 W. H. Dall. It has five post-nuclear whorls, and measures: Length 

 4.6 mm., diameter 2.5 mm. Another specimen, Cat. no. 159468, 

 U.S.N.M., also collected by Doctor Dall, comes from 12 fathoms, mud 

 bottom, St. Paul, Kadiak Island, Alaska. 



ODOSTOMIA (EVALEA) JEWETTI Dall and Bartsch. 



Plate 2.3, fig. :}. 



Odostomia (Evalca) jewetti Dall and Bartsch, Proc. U. S. Nat. Mus., vol. .33, 

 1907. pp, 523, 524, pi. 47, fig. 3. =Odostomia inflata Carpenter, part, Ann. 

 Mag. Nat. Hist., vol. 15, 1865, p. 394. 



Shell elongate-ovate, white. Nuclear whorls very small, smooth, 

 obliquely immersed in the first of the succeeding turns, above which 

 only the last one is visible. Post-nuclear whorls well rounded, a little 

 more abruptly so on the posterior tliird between the sutures. Sum- 

 mits very narrowly flattened which renders the sutures well marked. 

 Periphery of the last whorl slightly angulated. Base slightly con- 

 tracted, moderately rounded between the periphery and umbilical 

 area, narrowly produced to reenforce the columella. Entire surface 

 marked by numerous somewhat wavy, sid)ec[ual and subequally 

 spaced minute slender spiral lirations, of which there are about 35 

 between the summit and the periphery and an equal number between 

 the periphery and the base on the last turn. Aperture large, patulous 

 anteriorly; posterior angle acute, outer lip thin at the edge, thick 

 within; columella curved, somewhat reflected, leenforced by the 

 attenuated base, and provided with a strong oblique fold at its 

 insertion. 



The two cotypes (Cat. no. 15521c, U.S.N.M.) were collected by 

 Colonel Jewett at Santa Bar])ara, California. One is a young speci- 

 men consisting of the nucleus and three post-nuclear whorls; the other 

 )uis lost the nucleus and probably the first two post-nuclear turns; the 

 five which remain measure: Length 6.1 mm., diameter 3.3 mm. 



ODOSTOMIA (EVALEA) INFLATA Carpenter. 



Plate 23, fig. 7. 



Odostomia (Evalea) inflata (Carpenter) Dall and Bartsch, Proc. U. S. Nat. Mus., 

 vol. 33, 1907, p. 524, pi. 47, fig. 8. 



Shell ovate, white. Nuclear whorls decollated. Post-nuclear 

 whorls inflated, gently curved over the anterior two-thirds of the 

 whorl between the sutures and more strongly so on the posterior 

 third, this portion forming an evenly curved shoulder. Extreme 

 summit of the whorls slightly flattened and narrow, rendering the 



