ORTMANN: monograph of the naiades of PENNSYLVANIA. 



295 



Chemung River, South Waverly, Bradford Co. 



Other localities represented in the Carnegie Museum: 



Ottawa, Ontario, Canada (Hartman collection) (marked: " Lea datum "). 



St. Lawrence River, Bluff Island, Clayton, Jefferson Co., New York (Miss .\. H. Robinson) (H. Kahl); 



Grindstone Island, Clayton, Jefferson Co., New York (H. Kahl)."^ 

 Severn River, Gloucester Pool, Muskoka Co., Ontario, Canada (0. A. Peterson). 

 Spider Bay of Georgian Bay, Sans Souci, Parry Sound, Ontario, Canada (H. Kahl). 

 Connecticut River (Hartman collection). 

 Herkimer Co., New York (Smith collection). 



Keuka Lake, Yates Co., New York (G. H. Clapp, donor) (Lake Ontario-drainage). 

 Little Lakes, Herkimer Co., New York (Smith collection)."* 

 Newton Lake, Camden Co., New Jersey (C. H. Conner) (See above). 



Delaware River, Newbold, Gloucester Co. (C. H. Conner); and Fish House, Camden Co., New Jersey. 

 Potomac River, Washington, D. C. (G. H. Clapp, donor). 



Distribution and Ecology in Pennsylvania (See fig. 31): In Pennsylvania this 

 species is found in the Delaware and Susquehanna drainages, but it is absent in 



Fig. 31. 



• Lampsilis radiata. 



■ Lampsilis cariosa. 



+ Lampsilis ochracea. 



the smaller streams which flow to the Potomac. Altogether it is rare according 

 to my experience, but this may be due to the fact that I did not do much collecting 



"' A dwarf form, with light brown ground-color of epidermis. These specimens might represent 

 U. borealis Gray. 



"^ Tliis is in Herkimer Co., not in Otsego Co., as given by Lewis (18.56, p. 2.59). These lakes drain 

 into Otsego Lake, and this in turn into the Susquehanna River. 



