the Shells of Maine. 337 



nograph No. 5, PI. 14, figs. 1, 4, and 5, excepting 4, '^a dis- 

 torted " specimen from Oregon, which bemg distorted, is en- 

 titled to no consideration whatever, if indeed it belongs to that 

 species?) Entertaining these views, I cannot abandon it with- 

 out more positive testimony. It inhabits a pond in the town 

 of Unity, where I am informed by Dr. Milhken, its discoverer, 

 it sometimes occurs in great numbers. 



L. ampla, Migh. For a description of this fine species, the 

 reader is referred to another part of this Journal. It inhabits 

 the 2d Eagle Lake, Maine, N. lat. 47°. 1 am indebted to 

 Mr. A. W. Longfellow for four specimens, no two of which 

 are exactly alike. 



Genus Amnicola. Gould and Hald. 



A. lustrica, Say. Found sparingly, in small stream.s and 

 springs, at several localities. 



A. jjorata, Say. Found at Monmouth by Mr. True, to 

 whom I am indebted for specimens. 



Genus Paludina. Lam. 



P. decisa, Say. This species occurs as far north as 

 2d Eagle Lake, lat. 47°, and is very abundant every- 

 where. 



Genus Valvata. Muller. 



V. pujjoidea, Gould. Found at Monmouth by Mr. True. 

 Rare. 



Genus Ancylus. Muller. 



A. rivularis, Say. Found in plenty, clinging to the under 

 side of the leaves of the yellow lily, (yuphar advcnaj Lin.^ 

 in ditches and sluggish streams. 



Genus Natica. Brug. 



N. heros. Say. Littoral, and abundant near low-water mark 

 on all our sandy and muddy shores. I have traced it as far 

 north and east as the Bay of Fundy. 



