I9I3-] ORTMANN— THE ALLEGHENIAN DIVIDE. 32 L 



List No. 22. 



i. Elliptio complanatus (Dillw.) 



2. Strophitus edentulus (Say) 



3. Eurynia constricta (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. 23. 



1. Margaritana margaritifera (L.) 



2. Lexingtonia sub plana (Conr.) 



3. Elliptio complanatus (Dillw.) 



4. Elliptio fisherianus (Lea) 



5. Elliptio productus (Conr.) 



6. Elliptio lance olatus (Lea) 



7. Symphynota tappaniana (Lea) 



8. Anodonta Cataracta Say 



9. Anodonta implicata Say 



10. Alasmidonta collina (Conr.) 



11. Alasmidonta heterodon (Lea) 



12. Alasmidonta undulata (Say) 



13. Alasmidonta marginata susquehannae (Ortm.) 



14. Alasmidonta varicosa (Lam.) 



15. Strophitus undulatus (Say) 



16. Strophitus edentulus (Say) 



17. Eurynia constricta (Conr.) 



18. Eurynia nasuta (Say) 



19. Lampsilis radiata (Gmel.) 



20. Lampsilis cariosa (Say) 



21. Lampsilis ochracea (Say) 



