UPPER TENNESSEE DRAINAGE. 577 



This may be only a variety with purple nacre of E. trabalis, but 

 I have not yet seen any intergrades. 



It is characteristic for the Clinch River, where it is not rare in 

 Virginia (from Speer's Ferry, Scott Co., up to Cedar Bluff, Taze- 

 well Co.). In addition, it is in the Powell at dinger, Lee Co., Va. 

 (Walker coll.) ; in the North Fork Holston, from Rotherwood, 

 Hawkins Co., Tenn., to INIendota, Washington Co., Va. ; and in 

 Emory River, Harriman, Roane Co., Tenn. 



In the Tennessee and Holston proper, and their eastern mountain 

 tributaries, no trace of this species has ever been found. 



Type locality: Tennessee. 



67. EuRYNiA NEBULOSA (Courad), 1834. 



Unio nehulosus Conrad, '34. — Unio cumberlandianus Lea, '36. — Unio 

 cumberlandictts Lea, '38. — Unio notatus Lea, '38. — Unio glaber 

 Lea, '38. — Unio creperus Lea, '38. — Unio muelilfeldianus Lea, 

 '38. — Unio siimis Lea, '38. — Unio obsciinis Lea, '38. — Unio seig- 

 lerianus Lea, '38. — Unio amanus Lea, '40. — Unio fatuiis Lea, 

 '40. — Unio dactylns Lea, '40. — Unio tener Lea, '40. — Unio regu- 

 laris Lea, '41. — Unio puniceus Haldeman, '42.— Unio radians 

 Lea, '57. — Unio jonesi Lea, '59. — Unio discrepans Lea, '60.— 

 Unio scitidus Lea, '60.— -Unio linguccformis Lea, '60. — Unio per- 

 pictus Lea, '60. — Unio planicostatus Lea, '60. — Unio spams Lea, 

 '68. — Unio dispansus Lea, '71. — Unio glaber, iris, cumberlandi- 

 anus, jonesi, spams Lewis, '71, and 'y2. — Unio muhlf eldtianiis 

 Pilsbry & Rhoads, '96. — Eurynia ncbidosa, dispansa, and plani- 

 costata Ortmann, '13&, p. 311. — Eurynia nebulosa Goodrich, '13, 

 p. '94. — Euryfiia (Micromya) nebulosa Ortmann, '15, p. 64 

 (anatomy). 



Simpson, '14, has recognized the identity of a great number of 

 these nominal "species," but not of all of them. He gives (pp. 119 

 and 120) : cumberlandianus (Cumberland R., Tenn.) ; notatus (Cum- 

 berland and Holston R., Tenn.) ; glaber (Holston R., Tenn.) ; radians 

 (O'thcalooga Cr., Gordon Co., Ga.) ; jonesi (Euharlee Cr., Ga.) ; c?/j- 

 crepans (North A\a.hmna.) ; scituliis (Tuscumhla., Ala..) ; linguccformis 

 (Colum'bia, Ga., and French Broad R., Tenn.) ; perpictus (Bull R. 



