OF NORTH AMERICA. 161 



Omphiscola BECK, Index, p. 110, 1833 (L. glabra Muller), H. & A. ADAMS, 

 Genera Rec. Moll., II, p. 255, 1855. 



Omphiscola MEEK, 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, RADULA and GENITALIA : Not examined. 



REMARKS : Leptolimncea 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. Leptolimncea appears to con- 

 stitute a group of subgeneric importance. So far as known, no rep- 

 resentatives of this group have been found in America. 



