132 AMERICAN JOURNAL 



of Alabama River, while the elongate ones are found in the 

 Tennessee. 



In the latter are included a very distinct group, typified by 

 Postellii, of Lea, belonging to the tributaries of the Tennessee, 

 in Northwest Georgia. Two or three allied species are found 

 in Florida. 



Among the tuberculate species, I have included G. occata, 

 Hinds, — a California shell, of very doubtful generic character. 



The plicate species number eighty-five, of which about half 

 inhabit the Tennessee River. A few of these extend into the 

 Cumberland, and one or two to the Green River, of 

 Kentucky. 



On the other side, a very few (five only) of the plicate 

 species are found also in the Coosa and Black Warrior Rivers. 

 Five species occur in Oregon and California. One species is 

 reported from South Carolina, and two from Florida. The 

 Ohio and Illinois Rivers each possess a species ; and several 

 occur in the Flint and Savannah Rivers, of Georgia. 



G. suturaUs, Haldeman, reported from Ohio, is more likely 

 a Georgia species, identical with one recently described by 

 Mr. Lea. 



Twenty-seven angulate species are about equally distributed 

 in the Coosa and Tennessee Rivers. One of them, sordida, 

 Lea, occurs both in the Cumberland and in Saline River, 

 Arkansas. 



G. Potosiensis, Lea, is found in St. Francis River, Mo. 



G. jjToxima, Say, occurs in the Holston and Santee Rivers. 



G. hicincia, Anth., inhabits the Cahawba, Chattahoochee, 

 Savannah, Roanoke, and is also reported from North Carolina 

 and Arkansas ! 



Mr. Anthony's habitat, " Ohio," for his G. tecia is an error ; 

 the shell is known to come from the Coosa River. 



It is also very doubtful whether the specimens of Mr. Lea's 

 G. Spartanburg ensis^ from the Ohio River and from South 

 Carolina, really belong to the same species. In such cases 

 the authority for the alleged habitats should be rigorously in- 

 vestigated. 



Of the twenty-six short, clavate, smooth species, a small 

 group, with dark-colored, inflated shells, are quite characteristic 

 of E. Tennessee and southern W. Virginia. Five species are 

 found in the Ohio River and the Lakes, and two, both of 

 which will probably be found to be sometimes plicate, occur in 

 the rivers of the Pacific States. 



There are forty-three smooth, elevated Goniobases, of which 

 about one-fourth inhabit the Tennessee, and the same number 

 the Alabama River. Seven or eight occur in the Ohio River 

 and Great Lakes, and two are found in California. 



