50 



2. PISIDIUM ^QUILATERALE, Prime. 



Smithson. Monogr. 



a. Maine. 



b. Massachusetts. 



c. Hudson river. 



3. PISIDIUM COMPRESSUM, Prime. 



Smithson. Monogr. 



a. Canada. 



b. Maine. 



c. Massachusetts. 



d. Western New York. 



e. Westchester Co., N. Y. 



f. New Jersey. 



g. Virginia. 



h. Stanislaus County, Ca. 



j . St. Ignace Island, Lake Superior. 



k. Arizona. 



1. Cyclas altilis, Anthony. Miami Canal, Ohio. (Ex 

 auctore.) 



m. Pisidium cicet, Prime. Western New York. 



4. PISIDIUM VARIABILE, Prime. 



Smithson. Monogr. 



a. Maine. 



b. New Hampshire. 



