I9I3-] ORTMANN— THE ALLEGHENIAN DIVIDE. 293 



3. Crenodonta plicata undulata (Barn.) 



4. Quadrula pustulosa (Lea) 



5. Quadrula tuber culata (Barn.) 



6. Quadrula metanevra (Raf.) 



7. Quadrula cylindrica (Say) 



8. Rotundaria tuber culata (Raf.) 



9. Plethobasus cyphyus (Raf.) 



10. Pleurobema obliquum (Lam.) 



11. Pleurobema obliquum pyramid atum (Lea) 



12. Pleurobema obliquum coccineum (Conr.) 



13. Pleurobema clava (Lam.) 



14. Elliptio crassidens (Lam.) 



15. Elliptio dilatatus (Raf.) 



16. Symphynota costata (Raf.) 



17. Alasmidonta marginata (Say) 



18. Strophitus edentulus (Say) 



19. Cy progenia irr or ata (Lea) 



20. Ob ovaria cir cuius lens (Lea) 



21. Nephronaias ligamentina (Lam.) 



22. Plagiola depressa (Raf.) 



23. Paraptera gracilis (Barn.) 



24. Proptera alata (Say) 



25. Eurynia recta (Lam.) 



26. Lampsilis luteola (Lam.) 

 2J. Lampsilis ovata (Say) 



28. Lampsilis ovata ventricosa (Barn.) 



29. Lampsilis multiradiata (Lea) 



30. Lampsilis orbiculata (Hildr.) 



31. Truncilla triquetra (Raf.) 



32. Truncilla perplexa rangiana (Lea) 



Aside from the six species found only below Pittsburgh, the fol- 

 lowing nine of list no. 1 are missing here: nos. 2, 19, 21, 22, 25, 26, 



29, 38, 39- 



A very similar fauna goes up the Monongahela River. Unfor- 

 tunately, this fauna is now destroyed, and our knowledge of it rests 

 upon a collection in the Carnegie Museum made before 1897 by 



