1913-1 ORTMANN— THE ALLEGHENIAN DIVIDE. 293 



3. Crenodonta plicata nndulata (Darn.) 



4. Qiiadnila piistulosa (Lea) 



5. Quadrula tiiherculata (Barn.) 



6. Quadrula mctancvra (Raf.) 



7. Qtiadnila cylindrica (Say) 



8. Rotundaria tubercidata (Raf.) 



9. PletJwbasus cyphyus (Raf.) 



10. Pleiirohema obliqunm (Lam.) 



11. Plcnrobcina obliqunin pyramidatum (Lea) 



12. Pleurobema obliqunm coccineum (Conr.) 



13. Pleurobema clava (Lam.) 



14. ElUptio crassideiis (Lam.) 



15. Elliptio dilatatus (Raf.) 



16. Symphyiiota costata (Raf.) 



17. Alasinidonta margiiiata (Say) 



18. Strophitiis edentuUts (Say) 



19. Cy progenia irrorata (Lea) 



20. Obovaria circidus lens (Lea) 



21. Nephronaias ligamentina (Lam.) 



22. Plagiola dcpressa (Raf.) 



23. Paraptera gracilis (Barn.) 



24. Propter a alata (Say) 



25. Eurynia recta (Lam.) 



26. Lampsilis luteola (Lam.) 

 2^. 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. I 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 



