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AMERICAN JOURNAL 



utaries. There are small shells (a variety of A. Tryoni) m th& 

 Holston which likewise differ from the Alabama River shells. A. 

 Tryoni is found abundantly near Concord. 



73. Anculosa virgata, Lea. I have no difficulty in identifying 

 certain small shells of the Holston by Mr. Lea's figure and de- 

 scription of Melania virgata. Mr. Wheatley has the same spe- 

 cies from the Tennessee River, which he calls ^'■Anculosa vittata,. 

 Lea," his specimens beino; possibly a little larger and less perfect 

 than those found in the Holston. In my Catalogue of the Shells 

 of the Coosa River I included Anculosa vittata, Lea, quoting- 

 from Mr. Lea's " Observations." Later, I have from Dr. Scho- 

 walter (who furnished Mr. Lea original specimens of A. vittata} 

 a statement of error of locality, which he corrects by stating 

 that A. vittata was not found in the Coosa, but in a smaller 

 stream, a tributary of the Coosa. I am persuaded that A. vit- 

 tata can scarcely occur in two systems of drainage so distinct. 

 If, however, such is found to be the case, vittata will unquestion- 

 ably yield priority to virgata. Miss Law informs me that A. 

 virgata is found on one of the dams at Little River Shoals, and 

 is attainable only under difficulties. She has found it in no other 

 locality. It differs in habit from Anculosa subglobosa, Say, with 

 which Mr. Tryon has united it in his S3a'ionymy and elsewhere.. 



74. Ancylus ? An abundant species on the 

 rocks in the Holston. I have not been able to identify the spe- 

 cies, but have no doubt so common a species may long since have 

 been described. 



75. Angitrema verrucosa, Raf. A common and somewhat 

 variable species in the Holston, Clinch and Tennessee Rivers. 

 Immature specimens that agree with Mr. Lea's figure of Melania 

 Holstonia, are not rare. Smooth specimens sent to Mr. Wheat- 

 ley were returned by him as LitJtasia fuJiginosa, Lea. I am not 

 acquainted with that species, but by a comparison of Mr. Lea'a 

 figure of it I am unable to identify my shells with it. 



76. Eurycoelon AntJionyi, Redf. Found somewhat abun- 

 dantly on Ohota Shoals, but is quite rare in other portions of 

 the Holston examined by Miss Law. I have a single specimen 

 of this variable species that sufficiently resembles Mr. Lea's fig- 

 ure of Lithasia Tuomeyi. Others resemble his figure of ^hc?*- 

 losa turbinata. This species grows larger in portions of the Ten- 

 nessee River reached by Mr. Wheatley 's correspondents. Miss 

 Law has found very large specimens of this species in Indian 

 Mounds, showing that in former times it probably attained a 

 much greater development than at the present day. 



77. lo brevis, Anth. 



