52 
OBSERVATIONS. 
This singular shell approaches the genus Anculo- 
tus, in form, but the aperture is that of a Melania. | 
found it adhering to logs in the Tennessee river, at 
Florence, where it is abundant. My friend, WiLLtiam 
Hopason, sr. found it also in the Holston river, in 
‘Tennessee. 
MELANIA PYRENELLA. 
Puate VIIL—Fig. 5. 
DESCRIPTION, 
Shell elevated, with flattened whorls, having an 
obsolete spiral line on each; suture impressed; body 
whorl angulated; angle defined by a prominent line; 
base hardly convex; labrum angulated near the cen- 
tre; aperture patulous; columella obtusely rounded 
at the base. 
OBSERVATIONS. 
Inhabits streams in North Alabama. The aper- 
ture is remarkably patulous and the labrum pro- 
foundly angulated. 
MELANIA BITANIATA. 
PLaTe VIll.— Fig. 6. 
DESCRIPTION, 
Shell conic, with convex whorls; spire short; one 

