Ortmann : Unionid^ of Western Pennsylvania. 179 



This species is cited by Conrad from the " Mahoning River, near 

 Pittsburgh," while Lea says: "Mahoning River, Ohio." The point 

 of the Mahoning River nearest to Pittsburgh is where it joins the 

 Shenango, thus forming the Beaver, near Mahoningtown, Lawrence 

 County, about forty-five miles from Pittsburgh. The species is still 

 present there, and I regard this part of the Mahoning River as the 

 type-lflcalify. 



Unio viridis Conrad (Monogr., 4, 1836, and U. tappanianus Lea, 

 Observ., II, 1838) = Syinphyuota viridis (Conrad). 



From the "Juniata River," according to Conrad, and from the 

 " Juniata at Hollidaysburg (Blair Co.)" according to Lea. Although 

 Unionidge have recently been collected at Hollidaysburg, this species 

 is not among them. Nevertheless it is present in the Raystown 

 Branch of the Juniata River, and even farther west, in the head- 

 waters of the West Branch of the Susquehanna in Indiana County. 



In 1 89 1, E. H. Harn published a list of shells from western Penn- 

 sylvania (Nautilus, 4, 1 89 1, pp. 136-137). Harn was located at 

 Blairsville, Indiana County, and apparently most of his Unionidae 

 were from the Kiskiminetas, or the Conemaugh drainage. It is much 

 to be regretted that this list does not give exact localities, since at 

 present the fauna of the Kiskiminetas and its tributaries is almost com- 

 pletely destroyed, only meager remains surviving in a few of the head- 

 waters. 



Harn's list is here submitted. All the species have recently been 

 found in western Pennsylvania. The correct name according to the 

 modern nomenclature is given. 

 I. Unio aesopus Green = Pleurobema cesopiis (Green). 

 2. 



" alatus Say = Proptera alata (Say). 



'' circulus Lea ^ Ohovaria circulus (Lea). 



** clavus Lamarck = Pleurobema claim (Lamarck). 



** crassidens Lam. =: Unio crassidens Lamarck. 



«' cylindricus Say = Quad ru la cylindrica (Say). 



7. ** gibbosus Barnes = 6'>«'<? ^/(^^(?5/« Barnes. 



8. '< fabalis \^^2i=^ Microviya fabalis {X^^z.'). 



9. ** iris Lea = Lampsilis iris (Lea). 



10. '* kirtlandianus Lea = Quadrula siibrotunda kirtlandiana 



(Lea). 



11. ** ligamentinus Lamarck = Lampsilis ligamentina (Lamarck). 



