250 AGRICUlvTURE OF MAINE. 



Pisidium compressum, Prime. 



All over the State. 

 Pisidium compressum var. altile (Anthony). 

 Cyclas altilis, Anthony, 1847. 



Westbrook, Cumberland county (Norton). 

 Pisidium fallax, Sterki. 



Aroostook river, rare (Ny lander). 

 Pisidium fallax var. errans, Sterki. 



Pisidium fallax var. septentrionale, Sterki. 



Aroostook and Little Madawaska rivers (Nylander). 

 Pissidium punctatum, Sterki. 



Portage lake and Little Madawaska river, rare 

 (Nylander). 

 Pisidium variabile. Prime, 1851. 



Cyclas nitida, Mighels and Adams, 1842. 

 All over the State. 

 Pisidium aequilaterale. Prime. 



All over the State. 

 Pisidium adamsi. Prime. 



Cyclas nitida, Alighels, 1841. 

 All over the State. 

 Pisidium henslowanum, Sheppard. 



Aroostook county, two young specimens, apparently 

 rare, collected by O. Nylander (Sterki). 

 Pisidium noveboracense, Prime. 



Buckfield, Oxford county (John A. Allen) ; Fogelins 

 lake, Aroostook county (in Bryant Walker's collec- 

 tion, received from Nylander), 

 Pisidium succineum, Sterki. 



Mud pool in old lime quarry, Thomaston, Knox county 

 (Lermond). 

 Pisidium walked, Sterki. 



Aroostook county (Nylander). 

 Pisidium mainense, Sterki. 



Aroostook county (Nylander). 

 Pisidium roperi, Sterki. 



Dennysville, Washington county (Bryant Walker) ; 

 Aroostook county (Nylander). 



