UPPER TENNESSEE DRAINAGE. 541 



Rock River, Flint River in Madison Co., Elk River, Shoals Creek, 

 Bear Creek). 



15. QuADRULA METANERVA (Rafinesque), 1820. 



Obliqnaria mctanerva Rafinesque, '20. — Unio metanerva Lewis, '71. 



— Quadnda iiietancrz'a Ortmann, '12b, p. 255 (anatomy). — 



Qiiadnila metanerva Simpson, '14, p. 834. 



In the Tennessee at and below Knoxville. Above Knoxville, I 

 found only a single specimen in the Holston, at Mascot, Knox Co. 

 Rare. 



Type locality: Kentucky River (according to Vanatta, '15, the 

 types are from Ohio River). 



16. OUADRULA INTERMEDIA (Conrad), 1836. 



Unio intermedins Conrad, '36. — Unio tnberosns "Lea., '40. — Unia 

 sparsiis Lea, '41. — Unio intermedins, sparsns, tnberosns Lewis,. 

 '71. — Quadrula sparsa Ortmann, '12b (anatomy). — Quadnda in- 

 termedia Goodrich, '13, p. 93. — Quadrula tnberosa, tubcrosa 

 sparsa, intermedia Simpson, '14, pp. 836, 837. 

 According to Simpson, Q. tubcrosa is more swollen than Q. in- 

 termedia, and I have seen rather swollen specimens in the Walker 

 collection from the Cumberland River and the Tennessee in North 

 Alabama. However, the original figure oi U. tuberosus Lea is not 

 much swollen. My specimens from the upper Tennessee drainage 

 are all more or less compressed. We might have here again a case 

 where in larger rivers a more swollen form turns up. But even if 

 this should be correct, we should only regard these forms as races 

 of the same species. 



Reported from Nolichucky, Holston, Clinch, and Tennessee 

 rivers, and said to be abundant. According to the material collected 

 and seen by myself, it is decidedly a rare species. I know it from the 

 Holston at Church Hill, Hawkins Co., Tenn. ; from the South Fork 

 Holston at Pactolus and Bluff City, Sullivan Co., Tenn. ; from North 

 Fork Holston at Mendota, Washington Co., Va. ; and from the 

 Clinch River at Clinchport, Scott Co., Va. (Walker coll.), and 

 Cleveland, Russell Co., Va. 



