292 ORTMANN— THE ALLEGHENIAN DIVIDE. [April i8, 



28. Obovaria retusa (Lam.) 



29. Ohovaria cir cuius (Lea) 



30. Ohovaria circtdus lens (Lea) 



31. Obovaria ellipsis (Lea) 



32. Nephronalas ligauientina (Lam.) 

 2)2,- Amygdalonaias elegans (Lea) 



34. Amygdalonaias donaciformis (Lea) 



35. Plagiola depressa (Raf.) 



36. Paraptera gracilis (Barn.) 

 T^y. Proptera alata (Say) 



38. Eiirynia fabalis (Lea) 



39. Eurynia iris (Lea) 



40. Eurynia recta (Lam.) 



41. Lampsilis liiteola (Lam.) 



42. Lampsilis ovata (Say) 



43. Lampsilis ovata ventricosa (Barn.) 



44. Lampsilis midtiradiata (Lea) 



45. Lampsilis orbiculata (Hildr.) 



46. Truncilla triqiietra (Raf.) 



47. Truncilla perplexa rangiana (Lea) 



It should be noted, that, of these, six forms (nos. 6, 11, 28, 31, 

 33, 34) have been found exckisively in the Ohio below Pittsburgh, 

 while nine forms (nos. 3, 15, 16, 19, 25, 30, 38, 39, 47) have not been 

 found there, but only above Pittsburgh, but they are found else- 

 where in the Ohio drainage, so that they are not restricted to this 

 region. No. 21 has been found only once, in the headwaters of the 

 Monongahela, in West Fork River, in Lewis Co., W. Va. Thus 

 there are J7 forms in the Ohio beloiv Pittsburgh. 



II. Lower Allegheny and Monongahela Rivers. 

 There are, in the Allegheny River above Pittsburgh and below 

 Franklin, Venango Co., Pa , the following Najades. 



List No. 2. 



1. Fusconaia subrotnnda (Lea) 



2. Fusconaia undata rubiginosa (Lea) 



