160 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



tion of a larger number of exami>les there seems to be no reason for 

 doubt upon that point. 



The subgenus Gyrauius has not heretofore been published as occurring 

 among our large fossil pulmonate moUuscan faunae of the West, but at 

 least two other species probably exist there, one in the Bear Eiver (Lar- 

 amie) strata, and the other in those of the Green Eiver 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 i)ortion of the Lara- 

 mie or the'lower portion of the Wahsatch Group. 



Genus LIMN^A Lamarck. 



Subgenus LEPTOLIMNEA Swainson. • 

 LiMN^A (Leptolimnea) minuscula (sp. 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, 3^ 

 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 Eock Eailroad station, Southern 

 Wyoming, where it is associated with Planorhis cirratus White, and also 

 a small Limnseid that is probably referable to Acella Haldeman. 



Genus HELIX Linnaeus. 

 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 full height about 7 millimeters. (Museum No. 8908.) 



Position and locality. — The coal-bearing series of strata at Evanston, 

 Wyo., where it is associated with //. evanstonensis White and other 

 forms. These strata belong either to the upper part of the Laramie or 

 the lower portion of the Wahsatch Grouj). 



