39 



Planorbis bicarinatus, Say, 1817. 



Helisoma bicarinatus, Morse, 1864. 

 Common all over the State. 

 Planorbis bicarinatus var. aroostookensis, Pilsbry, 1894. 



Aroostook county (Nylander). 

 Planorbis bicarinatus var. striatus, Baker, 1902. 



Fish River lakes, Aroostook county (Nylander). 

 Planorbis trivolvis. Say, 18 17. 



Planorbis trivolvis var. fallax, Halderman, 1844. 

 Planorbis megastoma, DeKay, 1843. 

 Planorbis lentus, Morse, 1864. 



Reported from Cumberland, Oxford, Waldo and 

 Aroostook counties. 

 Planorbis campanulatus. Say, 182 1. 



Planorbella campanulatus, Say, 182 1. 

 All over the State. 

 Planorbis exacutus. Say, 1821. 



Menetus exacutus, Morse, 1864. 



Reported from Oxford, Knox and Aroostook counties. 

 Planorbis parvus, Say, 18 17. 



Planorbis elevatus, Adams, Gould, Mighels. 

 Gyraulus parvus, Morse, 1864. 

 All over the State. 

 Planorbis dilatatus, Gould, 1841. 



"A few specimens only have been found in Harrison, 

 Cumberland county" (Morse, 1864 list). 

 Planorbis crista var. cristata, Draparnaud, 1805. 



Barren brook, Caribou, Aroostook county, "a* very 

 small shell and hard to locate" (Nylander). 

 Segmentina armigera (Say). 



Planorbis armigerus. Say, 1818. 

 Common all over the State. 

 Physa ancillaria, Say, 1825. 



Physa vinosa of authors, not of Gould. 

 Physa fragilis, Mighels, 1842; Morse, 1864. 

 All over the State. 

 Physa sayii, Tappan, 1839. 



Aroostook county (Nylander). 



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