186 Annals of the Carnegie Museum. 



19. Unio luteolus Lamarck =: Lampsilis luteola (Lamarck). 



From Coraopolis and Wampum in Philadelphia Academy and 

 Carnegie Museum. 



20. Unio metanevra Rafinesque = Qiiadrula metanevra (Rafinesque). 

 From Coraopolis in Philadelphia Academy and Carnegie Museum ; 



from Beaver in Philadelphia Academy. 



21. Unio multiradiatus Lea = Lampsilis multiradiata (Lea). 

 From Wampum in Philadelphia Academy and Carnegie Museum. 



22 and 23. Unio obliquus Lea (sic !) ■=Quadrula obliqua (Lamarck) 

 and Quadrula subrotunda (Lea). 

 Specimens from Coraopolis in Philadelphia Academy and Carnegie 

 Museum are in part obliqua, in part subrotunda. From Beaver there 

 are only five specimens of subrotunda in the Philadelphia Academy. 

 One specimen from Beaver in the Philadelphia Academy was labeled 

 varicosa 'Ledi = Pleurobenia cicatricosuin (Say), but it is an o\d sub- 

 rotunda. P. cicatricosum is not found in western Pennsylvania. 



24. Unio ovatus Say = Lampsilis ventricosa ovata (Say) and Lamp- 



silis ventricosa (Barnes). 

 A few specimens from Coraopolis in the Philadelphia Academy and 

 the Carnegie Museum represent the var. ovata the larger part the 

 typical ventricosa. A specimen from Beaver in the Philadelphia 

 Academy is var. ovata. The specimens from Wampum in the Phila- 

 delphia Academy and the Carnegie Museum are all ventricosa. 



25. Unio parvus Barnes, probably = Alicromya fabalis (Lea). 

 Rhoads reports one specimen from Wampum. It could not be 



found in the Philadelphia Academy. The Carnegie Museum pos- 

 sesses a number of specimens of Aficromya fabalis from Wampum, 

 and since the latter species is not mentioned by Rhoads, it is very 

 likely that he confounded it with L.ampsilis parva. 



26. Unio phaseolus Hildreth =Ptychobranchus phaseolus (Hildreth). 

 From Wampum in the Philadelphia Academy and the Carnegie 



Museum. 



27. Unio plicatus Lea = Quadrula undulata (Barnes). 



A specimen from Beaver, and a number of specimens from Wam- 

 pum in the Philadelphia Academy and the Carnegie Museum are all 

 undulata. Quadrula plicaia has not been found in the Ohio drainage 

 in Pennsylvania, while Q. undulata is quite abundant, chiefly so in 

 the Beaver drainage. 



28. Unio compressus De^hzyts = Symphynota compressa (Lea). 



