THE NAUTILUS. 125 



Differs from P. imitator in the decidedly convex outlines of the 

 upper part of the spire, making it stouter, the rounded posterior angle 

 of the mouth, free inner lip, etc. In some specimens which I refer 

 to this species as a variety or form, the aperture and peristome are less 

 typical, but the shape of the spire readily distinguishes them from P. 

 imitator. Localities for this variety, if such it is, are Lyndon Gulch, 

 near Los Gatos, and a tributary of the same, Santa Clara Co., Straw- 

 berry Creek, Berkeley, Contra Costa Co., and Conly Gulch, Santa 

 Cruz Co., all collected by Mr. W. J. Raymond. 



Named in honor of a West Coast friend. I wish for his sake it was 

 a foot long instead of two or three millimeters. 



Fluminicola eolumbiana Hemphill, n. sp. 



Shell subglobose, with very short, conic spire, and imperforate of 

 nearly imperforate axis. Moderately solid, of a dark olive or brown 

 color* glossy, with fine growth-strife. Whorls 4, separated by deep 

 sutures, the last whorl with a narrow ledge or shoulder below the 

 suture, then flattened and sloping, the periphery decidedly below the 

 middle of the whorl, broadly rounded ; base convex. Aperture large, 

 irregularly piriform, being narrow and angular above, bluish inside; 

 outer lip quite thin and sharp; columella broadly concave, heavily 

 white calloused; parietal wall almost free from callous, dark. Alt. 

 7.5, diaui. 6.8, longest axis of aperture 5.2 mm. 



Columbia River, Washington, near Wallula and near mouth of 

 Snake R.; Snake River, near Weiser, Idaho (H. Hemphill). 



The dark color, superior constriction and narrow but prominent 

 shoulder of the last whorl, accuminately narrowed posterior portion or 

 the aperture, and absence of callous on the inner lip, posteriorly, are 

 characters easily distinguishing this species from its congenors. It has 

 been known for some years under Mr. Hemphill's MS. name of " F. 

 nuttalliana var. columbiana," but it seems to be one of the most dis- 

 tinct species of the genus. 



Fluminicola erythropoma, n. sp. 



Shell small, globose-turbinate with short spire, perforate, thin but 

 moderately solid, silvery corneous in color, black where the soft parts 

 are retained, not glossy, nearly smooth. Whorls 3. separated by 

 impressed sutures, the last half more rapidly descending; last whorl 

 well rounded throughout. Aperture oblique, broadly ovate, angular 

 above; outer lip thin, inner lip concave below, slightly expanded, 



