182 Annals of the Carnegie Museum. 



Anodonta ferussaciana Lea^ Anodontoides ferussacianus (Lea). 

 *' footiana Lea = Anodonta grajidis footiana Lea. 

 ** gigantea l.edi^ Anodonta grandis gigantea 'L&di. 

 Unio gracilis Barnes = Froptera gracilis (Barnes). 



** hippopaeus Lea = Quadmla undiilata hippopcea (Lea). 

 Anodonta imbecillis Say. 

 Unio iris Lea = Lamps His iris (Lea). 



♦' laevissimus Lea = Propter a Icevissinia (Lea). 



** novi-eboraci Lea, see U. iris. 



" parvus Lea = Lampsilis parva (Barnes). 



" patulus Lea, see U. clavus. 

 Anodonta plana Lea, see A. gigantea. 

 Unio rubiginosus Lea =: Quadmla rubiginosa (Lea). 

 Anodonta subcylindracea Lea = Anodontoides ferussacianus subcylin- 



draceus (Lea). 

 Unio triangularis Barnes = Truncilla triquetra 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 Erie species given below, and accord- 

 ing to Sterki (Proceedings Ohio Academy of Sciences, 4, 1907) : 

 Truncilla peiplexa rangiana, Lampsilis ventricosa ovata, Proptera 

 IcBvissima, and Unio crassidens. Now it is remarkable, that Unio 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 Icevissinia has not been found at all in thfe 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 = .Sy/;///riv/^/<5! rt'.r/a/a (Rafinesque). 



2. Unio ligamentinus Lamarck = Lampsilis ligamentina (Lamarck) . 



3. Unio gibbosus Barnes. 



ii 



