THE NAUTILUS. 125 
at 
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, ete. 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 columbiana 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-striz. 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. All. 
7.5, diam. 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. 
SheJl small, globose-turbinate with short spire, perforate, thin but 
moderately solid, silvery corneous in color, black where the soft parts 
are retained, not glussy, nearly smooth. Whorls 33, 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, 
