xlv 



Cumberland, the lower parts of the Ohio, and is very 

 plentiful in the Wabash. 



LITHASIA. 



While the typical AngitremcB are essentially a 

 Tennessee group, the subgenus Llthasia extends 

 further southwards. Its large inflated species, five 

 in number, all occur in the Tennessee River at Flor- 

 ence, Alabama, and vicinity, while the more nume- 

 rous, compact, heavy species, approaching in form to 

 the typical Goniohases, are almost confined to the 

 Coosa and Cahawba Rivers. The exceptions are a 

 small group of three species, of which obovata is the 

 type, which inhabit the Ohio River and its Kentucky 

 and Indiana tributaries, and one singular subcylin- 

 drical species reported from the Cumberland. 



Mr. Anthony assigns Tennessee as the habitat of 

 his niideola ; but I think he is mistaken, as I have 

 specimens from the Coosa. 



STREPHOBASIS. 



Several of the species are reported only from 

 East Tennessee, while two of them occur in the 

 branches of the Alabama River. One of these is 

 found in both rivers. Prof. Haldeman is in error in 

 assigning Ohio River as the habitat of his St. citrta. 

 It has never been found there, but is one of the 

 most plentiful shells of the Tennessee River, and as 

 such, is in all our cabinets. 



Goniohasic Section. 

 These shells constitute three-fifths of the species 

 of Strejwmatidce. They are naturally divided into 

 two type forms : the first, heavy, compact, with 

 large subcylindrical body and short spire is eminently 

 characteristic of the Coosa River ; while the second, 

 containing narrow, elongated species, with high 

 spires of many whorls, although more extensively 

 distributed, is still very cliaracteristic of the waters 

 of the Tennessee River and branches. 



