53 



6. PISIDIUM FERRUGINEUM, Prime. 



Smithson. Monogr. 



a. Massachusetts. 



b. Western New York. 



7. PISIDIUM VENTRICOSUM, Prime. 



Smithson, Monogr. 



a. Massachusetts. 



b. Western New York. 



c. New Brunswick. 



d. Pisidium rotundatum, Prime. Hab. ? 



8. PISIDIUM STEENBUCHII, Morch. 



Bull. Mus. Comp. Zool. Harvard V. 

 Greenland. (Ex auctore.) 



9. PISIDIUM OCCIDENTALS, Newcomb. 



Smithson. Monogr. 

 California. (Ex auctore.) 



10. PISIDIUM ULTRAMONTANUM, Prime. 



Smithson. Monogr. 

 Canoe Creek, Ca. 



