LYMNIDZ OF NORTH AMERICA. 461 
Omphiscola Breck, Index, p. 110, 1833 (L. glabra Muller), H. & A. Adams, 
Genera Rec. Moll., II, p. 255, 1855. 
Omphiscola MrreK, Rep. U. S. Geol. Surv. Terr., IX, p. 533, 1876 (not of 
Raf.). 
SHELL: Very long, cylindrical; spire with numerous closely coiled 
whorls; aperture very small; axis twisted (plate XLVIII, figure 4). 
ANIMAL, JAW, RapuULA and GENITALIA: Not examined. 
Remarks: Leptolimnea differs from Stagnicola in its cylindrical 
shell, numerous closely coiled whorls and comparatively small aperture. 
What its anatomical relations may be is not known, specimens of the 
animal not being available for study. Leptolimnea appears to con- 
stitute a group of subgeneric importance. So far as known, no rep- 
resentatives of this group have been found in America. 
