210 BULLETIN G8, UNITED STATES NATIONAL MUSEUM. 



Aperture moderately large, oval, well rounded anteriorly; posterior 

 angle acute; outer lip thin; columella curved, slightly reflected, 

 reenforced, except at its extreme anterior end, by the attenuated base 

 and provided with a strongl}^^ oblique fold at its insertion. 



The type (Cat. no. 159267, U.S.N.M.) has five post-nuclear whorls 

 and measures: Length 4.3 mm., diameter 2.5 mm. It was collected 

 by Mr. Fisher at Tacoma, Washington. 



ODOSTOMIA (EVALEA) AMCHITK AN A, new species. 



Plate 24, fig. 7. 



Shell broadly conic, thin, semitranslucent, bluish-white. Nuclear 

 whorls very obliquely immersed in the first of the succeeding turns, 

 above which only the last half of the last turn is visible. Post- 

 nuclear whorls well rounded, faintly shouldered at the summit, 

 marked by fine lines of growth and numerous very fine equal and 

 equally spaced spirally incised lines, of which there are probably 

 more than forty between the periphery and the summit of the last 

 turn. Sutures rendered subchanneled by the slight shoulder at the 

 summit of the whorls. Periphery and base of the last whorl well 

 rounded, the latter somewhat attenuated and marked like the spaces 

 between the sutures. Aperture large, broadly pear-shaped, posterior 

 angle obtuse; outer lip broadly recurved, thin, showing the fine ex- 

 ternal striation within; columella slender, curved, and revolute; reen- 

 forced by the attenuated base and provided with a weak fold at its 

 insertion, which is not visible when the aperture is viewed squarely; 

 parietal wall glazed with a thin callus. 



The type (Cat. no. 161088, U.S.N.M.) and another specimen were 

 collected by Doctor Dall at Constantine Harbor, Amchitka Island, 

 Alaska. It has five post-nuclear whorls and measures: Length 3.3 

 mm., diameter 1.7 mm. 



Six specimens, collected by Mrs. Kate Stephens at Bear Bay, Peril 

 Straits, Baranofi" Island, Alaska, agree well with the present s])ecies. 

 Two of these form Cat. no. 204013, U.S.N.M. 



ODOSTOMIA (EVALEA) STEPHENSI, new species. 



Plate 24, fig. 5. 



Shell elongate-conic, bluish- white. Nuclear wdiorls almost com- 

 pletely obliquely immersed in the first of the succeeding turns, a])ove 

 which only the outer edge of the last volution projects. Post-nuclear 

 whorls rather high between the sutures, moderately rounded, orna- 

 mented by numerous fine but well incised subequal and subequally 

 spaced spiral lines; about thirty-three of which appear ])etween the 

 summit and the periphery of the last whorl. Suture well marked. 

 Peripher}^ of last whorl well rounded. Base rather prolonged, well 

 roimded, its entire surface marked by incised spirals like the spaces 

 between the sutures. In addition to the spiral markings the entire 



