ORTMANN: UNIONIDE® OF WESTERN PENNSYLVANIA. 184 
1o. Unio cornutus Barnes = Odliquaria reflexa Rafinesque. 
11. ‘** undulatus Barnes = Quadrula undulata (Barnes). 
12. §* obliquus Lamarck = Quadrula obliqua (Lamarck). 
These species, as well as the seven of Stupakoff’s list, are yet present 
in the Ohio River below Pittsburgh in Beaver County. In Allegheny 
County they now seem to be extinct, only Unio crassidens being 
found in the northeastern corner of the county, together with the four 
species mentioned above. 
In 1899, S. N. Rhoads (Nautilus, 12, 1899, pp. 133 ff.) published 
a list of shells collected by himself in the Ohio River at Coraopolis, 
Allegheny County, and at Beaver, Beaver County, and in the Beaver 
River, at Wampum, Lawrence County. The collections were made 
in September, 1898. A number of the duplicate specimens were 
secured by the Carnegie Museum, while the main collection went to 
the Academy of Natural Sciences in Philadelphia. I have gone over 
both collections, and am able to correct certain misidentifications. 
The collection from Wampum is controlled by a much larger collec- 
tion from the same place in the Carnegie Museum, secured in Septem- 
ber, 1897, by G. H. Clapp and H. H. Smith. 
The following species are recorded by Rhoads, and I append the 
necessary remarks : 
1. Anodonta edentula Say = Strophitus undulatus (Say). 
Three specimens from Coraopolis in the Philadelphia Academy are 
this species. In the same tray were several specimens of Symphynota 
viridis, which probably were put in by mistake, since this species is 
not found in the Ohio drainage. From Wampum in the Philadelphia 
Academy and Carnegie Museum. Also recorded from Beaver, but no 
specimens could be found in either collection. 
2. Anodonta gracilis Lea = Proptera gracilis (Lea). 
From Coraopolis and Beaver in the Philadelphia Academy. 
3. Anodonta marginata Say = A/asmidonta marginata Say. 
From Coraopolis in Philadelphia Academy, from Wampum in Phila- 
delphia Academy and Carnegie Museum. 
4. Margaritana rugosa Barnes = Symphynota costata ( Rafinesque ). 
_ From Coraopolis and Beaver in Philadelphia Academy ; from Wam- 
pum in Philadelphia Academy and Carnegie Museum. 
5. Unio zsopus Green = Pleurobema esopus (Green). 
From Coraopolis and Wampum in Philadelphia Academy. 
