Pisidium pauperculum var. 



Meadow brook, Rockland, Knox county, only two 

 specimens (Lermond). 





 Gastropoda. 



Campeloma decisa (Say), 1817. 



Paludina decisa, Mighels, Stimpson. 

 Melantho decisa, Morse, Gould. 



Everywhere throughout the State. 

 Campeloma rufum (Haldeman), 1841. 



South pond, in 20 to 40 feet of water, Buckfield, 



Oxford county (John A. Allen). 

 Valvata sincera, Say, 1824. 



Aroostook county (Nylander). 

 Valvata sincera var. nylanderi, Dall, 1905. 



Portage lake, Aroostook county, dredged in 18 to 25 



feet of water (Nylander). 

 Valvata tricar inata (Say), 1817. 



Sagadahoc, Knox, Penobscot and Aroostook counties. 

 Amnicola limosa (Say), 1817. 



All over the State. 



Amnicola limosa var. porata, Say, 1821. 

 Amnicola orbiculata, Lea, 1844. .- 



All over the State. 

 Amnicola limosa var, pallida, Haldeman, 1842. 



Amnicola lustrica, Adams, 1842; Mighels, 1843. 

 Amnicola pallida, Gould, 1870. 



Found sparingly in small streams and springs at sev- 

 eral localities (Mighels) ; Saco, York county (Went- 

 worth) ; Dyers river, South Jefferson, Lincoln 

 county (Mrs. Wentworth). 

 Lyogyrus pupoidea (Gould). 



Valvata pupoidea, Gould, 1840; Mighels, 1843. 



Monmouth, Kennebec county (Dr. True in Mighels' 

 1843 list) ; "occurs rarely in the southern portion of 

 the State" (Morse 1864 list) Orono, Penobscot 

 county (Anson Allen). 

 Ancylus borealis, Morse, 1864. 



Patten, Penobscot county (John M. Gould in Morse's 

 1864 list) ; St. John river at Fort Kent, Aroostook 

 county (Nylander). 



