1913] ORTAIANN— THE ALLEGHENIAN DIVIDE. 32 L 



List No. 22. 



1. Elliptio coinplaiiatits (Dillw.) 



2. Strophitus cdcntulus (Say) 



3. Eurynia const ricta (Conr.) 



These species are all found in the upper James, and one of them 

 (no. 3) clearly shows the affinity with that system. This is undoubt- 

 edly a depauperated fauna, corresponding to the small size of the 

 streams. Possibly the record is not complete. Below Roanoke, the 

 river is polluted, but east of the Blue Ridge there are surely addi- 

 tional species in this system. 



Summary of Facts Concerning the Eastern Fauna. 



Full list of all species known to exist on the Atlantic slope (in 

 the region investigated) : 



List No. 2^. 



1. Margaritana niargaritifera (L.) 



2. Lc.vingtonia snh plana (Conr.) 



3. Elliptio coniplanatus (Dillw.) 



4. Elliptio fisherianus (Lea) 



5. Elliptio productiis (Conr.) 



6. Elliptio lanceolatus (Lea) 



7. Sympliynota tappaniana (Lea) 



8. Anodonta cataracta Say 



9. Anodonta iniplicata Say 



10. Alasniidonta collina (Conr.) 



11. Alasniidonta heterodon (Lea) 



12. Alasniidonta nndiilata (Say) 



13. Alasniidonta niarginata susqiiehannae (Ortm.) 



14. Alasniidonta varicosa (Lam.) 



15. Strophitus undnlatus (Say) 



16. Strophitus edcntulus (Say) 



17. Eurynia constricta (Conr.) 



18. Eurynia nasuta (Say) 



19. LanipsiUs radiata (Gmel.) 



20. Lanipsilis cariosa (Say) 



21. Lanipsilis ochracea (Say) 



