ORTMANN: UNIONID® OF WESTERN PENNSYLVANIA. 182 
Anodonta ferussaciana Lea = Anodontoides ferussacianus (1.ea). 
WG footiana Lea = Anodonta grandis footiana Vea. 
se gigantea Lea = Anodonta grandis gigantea Lea. 
Unio gracilis Barnes = Proftera gracilis (Barnes). 
‘6 hippopzeus Lea = Quadrula undulata hippopea (Lea). 
Anodonta imbecillis Say. 
Unio iris Lea = Lampsilis tris (Lea). 
‘¢ levissimus Lea = Proftera levissima (Lea). 
‘¢ novi-eboraci Lea, see U. iris. 
‘¢ parvus Lea = Lampsils parva (Barnes). 
‘¢ patulus Lea, see U. clavus. 
Anodonta plana Lea, see A. gigantea. 
Unio rubiginosus Lea = Quadrula rubiginosa (Lea). 
Anodonta subcylindracea Lea = Anodontoides ferussacianus subcylin- 
draceus (Lea). 
Unio triangularis Barnes = Zruncilla triguetra Rafinesque. 
‘¢ undulatus Barnes = Quadrula undulata (Barnes). 
‘¢ verrucosus Barnes = Quadrula tuberculata (Rafinesque ). 
The question is, whether these species have reached western New 
York by way of the Allegheny River, or by way of Lake Erie. Since 
a large number of species are found in both drainages, it remains 
doubtful in the case of the majority of the forms recorded by Marshall, 
by which way they have travelled. Only in those cases where the species 
is positively absent from Lake Erie and its drainage, does the way 
of the Allegheny River seem to be positively indicated. These are, 
according to our list of the Lake Ene species given below, and accord- 
ing to Sterki (Proceedings Ohio Academy of Sciences, 4, 1907): 
Truncilla perplexa rangiana, Lampsilis ventricosa ovata, Proptera 
levissima, and Unio crassidens. Now it is remarkable, that Uzzo cras- 
sidens ascends in the Allegheny only as far as the northern part of 
Armstrong County, and is positively absent in this river above Oil 
City, and that Proptera levissima has not been found at all in the state 
of Pennsylvania. Thus it is seen that Marshall’s work must all be 
done over again. 
The next list published is that by S. H. Stupakoff (Nautilus, 1894, 
p- 135) from Allegheny County. It contains the following species : 
1. Margaritana rugosa Barnes = Symphynota costata (Rafinesque ). 
2. Unio ligamentinus Lamarck = Lampsilis igamentina (Lamarck). 
3. Unio gibbosus Barnes. 
