UPPER TENNESSEE DRAINAGE. 

 Powell Drainage. 



595 



North Fork Powell River, Big Stone Gap, JVise Co., Va. 

 Walker coll. (C. C. Adams, Sept. 4, '99). 



1. Fusconaia pilaris bursa-pastoris 



2. F. barnesiana bigbyensis 



3. Medionidus plateolus 



4. Eurynia nebulosa 



5. Lampsilis fasciola 



South Fork Poivcll River, Big Stone Gap, Wise Co., Va. 



* = Walker coll. (Adams, Sept. 4, '99); t= Carnegie Mus. 

 (Ortmann, May 15 and Sept. 6, '13). 



fl. Fusconaia pilaris bursa-pastoris 

 f2. F. barnesiana 

 *t3. F. barnesiana bigbyensis\ 

 t4. Lexingtonia dolabelloides con- 

 radi 

 *t5. Pleurobema oviforme argcn- 

 tetini 

 t6. Lasmigona badia 



t7. Alasmidonta minor 

 fS. Strophittis edcntulus 

 fg. Ellipsaria subtenta 

 *io. To.volasma lividum 

 *tii- Medionidus plateolus 

 *ti2. Eurynia nebulosa 

 ti3. E. vanuxemensis 



Poiifell River, Olinger, Lee Co., Va. 



Walker coll. (Adams, Sept. 5, '99). 



1. Fusconaia pilaris bursa-pastoris 7. 



2. F. cuneolus 8. 



3. F. barnesiana bigbyensis 9. 



4. Lexingtonia dolabelloides con- 10. 



radi 11. 



5. Pleurobema oviforme 12. 



6. Elliptio dilatafus 13. 



Lasmigona costata 

 Alasmidonta marginata 

 Ellipsaria subtenta 

 Medionidus plateolus 

 Eurynia perpurpurea 

 E. nebulosa 

 Lampsilis ovata ventricosa 



Poivell River, Dryden, Lee Co., Va. 



*=:Walker coll. (Adams, Sept. 3, '99); t==Carn. Mus. (Ort- 

 mann, Sept. 7, '13). 



fi. Fusconaia pilaris bursa-pastoris 



t2. F. barnesiana 

 *t3. F. barnesiana bighyensis\ 

 *t4. Lexingtonia dolabelloides con- 

 radi 



ts. Pleurobema oviforme 

 *t6. Elliptio dilatatus 



iy. Lasmigona badia 

 *t8. L. costata 



fg. Alasmidonta marginata 

 fio. Pegias fabula 

 fii. Strophitus edentulus 



*ti2. Ellipsaria subtenta 



*ti3. Medionidus plateolus 



*ti4- Eurynia nebulosa 



*ti5. E. vanuxemensis 

 ti6. Lampsilis ovata ventricosa 



*ti7. L. fasciola 



