160 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
tion of a larger number of examples there seems to be no reason for 
doubt upon that point. 
The subgenus Gyraulus has not heretofore been published as occurring 
among our large fossil pulmonate molluscan faune of the West, but at 
least two other species probably exist there, one in the Bear River (Lar- 
amie) strata, and the other in those of the Green River Group. 
Position and locality—Head of Soldiers’ Fork, Utah, where they were 
obtained by one of the parties of the survey in charge of Lieutenant 
Wheeler. The true age of the strata is not at present definitely known, 
but it is understood to be either that of the upper portion of the Lara- 
mie or the lower portion of the Wahsatch Group. 
Genus LIMNZZA Lamarck. 
Subgenus LEPTOLIMNEA Swainson. 
-Limn.azA (LEPTOLIMNEA) MINUSCULA (SD. NOV.). 
Shell rather small, moderately attenuate; spire much longer than the 
aperture; volutions six or seven, moderately convex, the distal border 
very narrowly appressed against each preceding coil; aperture small, 
elongate, subovate; columellar fold distinct, but not large. Surface 
marked by distinct lines of growth, but no revolving lines have been 
detected. 
The only two examples of this species that have been discovered are 
broken, but the full length of the larger one is estimated at 9 millime- 
ters; diameter of last volution, 3 millimeters; length of aperture, 34 
millimeters. (Museum No. 8907.) 
Position and locality—From strata belonging to either the basal por- 
tion of the Green River Group or the upper portion of the Wahsatch 
Group, about three miles east of Table Rock Railroad station, Southern 
Wyoming, where it is associated with Planorbis cirratus White, and also 
a small Limneeid that is probably referable to Acella Haldeman. 
Gants EDEN ietaaaie: 
Subgenus PATULA Haldeman. 
HELIX (PATULA) SEPULTA (sp. nov.). 
‘Shell convex above; umbilicus moderately wide; volutions about six, 
convex upon all sides except the inner; suture impressed; surface reg- 
ularly but minutely ribbed, the ribs having the same direction as the 
lines of growth. 
All the examples discovered are distorted by pressure, but the diam-. 
eter of the full coil of the largest example was about 12 millimeters and 
its fuil height about 7 millimeters. (Museum No. 8908.) 
Position and locality —The coal-bearing series of strata at Evanston, 
Wyo., where it is associated with H. evanstonensis White and other 
forms. ‘These strata belong either to the upper part of the Laramie or 
the lower portion of the Wahsatch Group. 
