SER ERE 
SE 
50 
2... PISIDIUM ÆQUILATERALE, Prime. 
Smithson. Monogr. 
Maine. 
Massachusetts. 
Hudson river. 
3... PISIDIUM COMPRESSUM, Prime. 
Smithson. Monogr. 
Canada. 
Maine. 
Massachusetts. 
Western New York. 
Westchester Co., N. VY. 
New Jersey. 
Virginia. 
Stanislaus County, Ca. 
St. Ignace Island, Lake Superior. 
Årizona. 
Cyclas altilis, Anthony. Miami Canal, Ohio. 
auctore.) 
.. Pisidtum cicer, Prime. Western New York. 
4... PISIDIUM VARIABILE, Prime. 
Smithson. Monogr, 
Maine. 
New Hampshire. 
(Ex 
