302 



DESCRIPTION OF NEW FRESH WATER AND LAND SHELLS. 



more impressed at the point of the umbilical region. The columella on the upper part of 

 these two specimens is not thickened, but it is of a dark-brown colour, and being also 

 dark below, the colour extends to the outer side of the whorl, and there makes two rather 

 indistinct bands. In outline it is allied to M.fusiformis, (Nobis,) but they differ entirely 

 in the columella and in the length of the aperture. The aperture is rather more than 

 one-half the length of the shell. 



I have had some doubts of the Scioto being the real habitat of this shell; but Mr. 

 Wheatley says it was sent from thence to him. It seems to have a more southern aspect. 



SYSTEMATIC INDEX. 



