ORTMANN: monograph of the naiades of PENNSYLVANIA. 



157 



Backwater of Hudson River, Milton, Ulster Co., New York (H. H. Smith) (young, intergrading from 



pond-form to iryoni-type). 

 Binghamton, Broome Co., New York (H. H. Smith)."" 



Culvert Pond, Sussex Co., New Jersey (J. F. L. Raeschen) (creek-form, but thin-shelled). 

 Delaware-Raritan Canal, Aquaeduct, near Princeton, Mercer Co., New Jersey (young, tryoni-type). 

 Delaware River, Fish House and North Cramer Hill, Camden Co., New Jersey (from both places the 



creek-form); Newbold, Gloucester Co., New Jersey (C. H. Conner) (cripples). 

 Potomac River, Washington, D. C. (Hartman collection) (tryoni-type). 

 South Branch Potomac River, Romney, Hampshire Co., West Virginia (chiefly creek-form, but some, 



from quiet pools, inclining to pond-form). 

 South River (upper Shenandoah), Waynesboro, Augusta Co., ^'irgiuia (thin-shelled creek-form from a 



quiet pool). 

 Paper-mill, Salem, Forsyth Co., North Carolina (Holland collection) (virgulata-type) . 

 Ashburn Creek, Mecklenl)urg Co., North Carolina (Hartman collection) (virgulata-type). 



Distribution and Ecology in Pennsylvania (See fig. 15) : In Pennsj'lvania this 

 species belongs to the Atlantic-drainage. It has indeed been reported by Marshall 



Fig. 15. 

 • Anodonta cataracta. -\- Anodonta iitiplirata. 



(1895) from the headwaters of the Genesee River in Potter Co., but this requires 

 confirmation. When I collected in the Genesee River and Cryder Creek, at Gen- 

 esee, Pennsylvania, I did not find any Anodontas. 



As the records show, A. cataracta is found in the drainages of all three Atlantic 

 rivers, the Delaware, Susquehanna, and Potomac. It apparently is most abundant 

 in the lowlands and on the Piedmont Plateau, but goes up considerably towards 



"' The label says: " Chemung River," but Binghamton is not on this River; the specimen has 

 all the earmarks of a pond-shell. 



