Ortmann : Unionid.« of Western Penxsylvania. 187 



Specimens from Wampum are in the Carnegie Museum. In the 

 Philadelphia Academy, of four specimens thus labeled, only one was 

 this species, the rest young Lavipsilis ligamentina. 



29. Unio pustulosus Lea = Quadrula pustulosa (Lea). 



From Coraopolis in Philadelphia Academy; from Wampum in 

 Philadelphia Academy and Carnegie Museum. 



30. Unio rectus Lamarck = Lampsilis recta (Lamarck). 

 From Corao]>olis and Beaver in the Philadelphia Academy. 



31. Unio rubiginosus Lea = Quadrula ruhiginosa (Lea). 

 From Coraopolis in the Philadelphia Academy. 



32. Unio securis Lea = Plagiola securis (Lea). 

 From Coraopolis in the Philadelphia Academy. 



33. Unio triangularis Barnes = Iruncilla triquetra Rafinesque. 

 From Coraopolis and Beaver in the Philadelphia Academy ; from 



Wampum in the Philadelphia Academy and Carnegie Museum. 

 Unio trigonus Lea. 

 Doubtfully reported by Rhoads from Coraopolis. The specimens 

 in the Philadelphia Academy under this name are young Quadrula 

 rubiginosa (Lea). 



34. Unio tuberculatus Barnes = Tritogonia tuberculata (Barnes). 

 From Coraopolis in the Philadelphia Academy; from Wampum in 



the Carnegie Museum. 



35. Unio verrucosus Barnes = Quadrula tuberculata (Rafinesque). 

 From Coraopolis and Beaver in the Philadelphia Academy ; from 



Wampum in the Philadelphia Academy and Carnegie Museum. 



Finally, C. T. Simpson (Proceedings LTnited States National Mu- 

 seum, 22, 1900, p. 553) records Lampsilis fatua (Lea) from the 

 Beaver River, Pennsylvania. The specimen, upon which this record 

 is founded, belongs to the Carnegie Museum, and is from Wampum, 

 collected by Clapp and Smith, and is nothing but Lampsilis iris (Lea). 



During his investigations, the writer has discovered a number of 

 additional species in western Pennsylvania. A list of all known 

 species is submitted here, giving the references to the older writers, 

 indicating the general distribution and giving in the case of the rarer 

 species the exact localities. Besides the material collected by the 

 writer other material belonging to the Carnegie Museum has been 

 used. Aside from the fine collection made at Wampum, Lawrence 

 County, by Clapp and Smith, and the duplicates from the Rhoads 



