OBSERVATIONS. 



This species is common in the Wabash river. The spire 

 is almost invariably so much decorticated, that no trace of 

 the longitudinal lines remains ; in the young only are the 

 lines distinct, and even in these they are sometimes obso- 

 lete or altogether wanting. 



It varies in the number of its series of tubercles, some 

 specimens having but one, and others, though these are 

 rare, as many as five or six. 



REFERENCE TO THE PLATE. 



The upper figures represent the shell in two positions 

 The middle figure exhibits the young shell. 



MELANIA DEPYGIS. 



SPECIFIC CHARACTER. 



Body whorl yellowish, with two equidistant, revolving, 

 rufous lines. 



DESCRIPTION. 



Shell oblong, conic-ovate, not remarkably thickened : 

 spire as long as the aperture, or rather longer, often much 

 eroded, with a broad, revolving, rufous line near the su- 

 ture, occupying a considerable portion of the surface: 

 whorls about five, hardly rounded : mture moderately im- 



PLATE VIII. 



