106 THE NAUTILUS. 



Sphcerium simile Say. Generally distributed. 



Sphcerium striatinum Lam. Fish River and Saint John River at 

 Fort Kent. 



Sphcerium rhomboideum Say. Fine specimen in Gelot Lake, New 

 Sweden, and all the smaller lakes of the Little Madawoska river 

 system. 



Galyculina securis Prime. Aroostook River. 



( 'alyculina sec/iris cardissa Prime. Square Lake and other localities. 



Pisidium abditium I laid. Common. 



Pisidium adamsi Prime. Cross Lake Inlet. 



Pisidium oequilaterale Prime. Portage Lake. Little Madawaska 

 River. 



Pisidium contortum Prime. Rear Mud Lake, Perham and West- 

 moreland. 



Pisidium compressum Prime. Generally abundant. 



Pisidium ferrugineum Prime. Fogelin Lake, New Sweden and 

 many other localities. 



Pisidium fallax Sterki. Aroostook River. 



Pisidium fallax liovculi' Sterki. Aroostook River at Caribou and 

 Little Madawaska River, New Sweden. 



Pisidium milium Held. South branch Caribou Stream, Woodland 

 and Sawyer's Brook, Castle Hill. 



Pisidium medianum minutum Sterki. Hacket's Mill Brook, a 

 tributary of Caribou Stream in the northern part of Woodland. 



Pisidium pauperculum Sterki. Little Madawaska River. 



Pisidium pauperculum nylanderi Sterki. Dredged in Portage Lake. 



Pisidium politum Sterki. Portage Lake and Cross Lake. 



Pisidium punctatum Sterki. Portage Lake, Little Madawaska 

 River. 



Pisidium roperi Sterki. Johnson Brook on the Fort Kent road 

 and north of Perham. 



Pisidium splendidulum Sterki. Barren Brook, Caribou and many 

 other localities. 



Pisidium ventricosum Prime. Barren Brook, Caribou. 



Pisidium variabile Prime. Common everywhere. 



Pisidium walkeri Sterki. Barren Brook, Caribou. 



Pisidium walkeri ■fnainense Sterki. Hacket's Mill Brook, Wood- 

 land and many other, localities. 



