SS) 
20. PISIDIUM PUSILLUM, Jenyns. 
Baudon Pisid. 1857. 
al tErance: 
b. Pisidtum fontinale, Pfeiffer. France. 
cC. w AN ng Dept. of Oise, France. 
d. og ig &; Savoy. 
et €… roseum, Scholtz. Silesia. (Ex auctore.) 
21. PISIDIUM OBTUSALE, Pfeiffer. 
Baudon Pisid, 1857. 
a. Dept. of Gers, France. 
b. Silesia. 
c. Pisidium minimum, Studer. Switzerland. 
22.. PISIDIUM DUPLICATUM, Pfeiffer. 
Pfeiffer SystsFAnordi "1821: 
Germany. (Ex auctore.) 
23.. PISIDIUM NITIDUM, Jenyns. 
Baudon Pisid, 1857. 
a. Dept. of Oise, France. 
by FÅ sens ig 
c.. Pisidium incertum, Normand. Valenciennes. (Ex auctore.) 
