292 ORTMANN— THE ALLEGHENIAN DIVIDE. [April 18, 



28. Ob ovaria retusa (Lam.) 



29. Ob ovaria cir cuius (Lea) 



30. Ob ovaria cir cuius lens (Lea) 



31. Ob ovaria ellipsis (Lea) 



32. Nephronaias ligamentina (Lam.) 



33. Amygdalonaias elegans (Lea) 



34. Amygdalonaias donaciformis (Lea) 



35. Plagiola depressa (Raf.) 



36. Paraptera gracilis (Barn.) 



37. Propter a alata (Say) 



38. Eurynia fabalis (Lea) 



39. Eurynia iris (Lea) 



40. Eurynia recta (Lam.) 



41. Lampsilis luteola (Lam.) 



42. Lampsilis ovata (Say) 



43. Lampsilis ovata ventricosa (Barn.) 



44. Lampsilis multiradiata (Lea) 



45. Lampsilis orbiculata (Hildr.) 



46. Truncilla triquetra (Raf.) 



47. Truncilla perplexa rangiana (Lea) 



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

 33, 34) have been found exclusively 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 37 forms in the Ohio below 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 subrotunda (Lea) 



2. Fusconaia undata rubiginosa (Lea) 



