668 THE LAND SNAILS OF NEW ENGLAND. 
several minute teeth, the longest one projecting from the 
body whorl. The number and size of these teeth vary 
greatly in this species, but the shell is quite characteristic 
when once determined. It is found in very wet places, 
under bits of wood by watery ditches. Found in nearly 
all the States this side of the Rocky Mountains ; common 
in New England. 
In the following species the lower tentacles are absent, 
and the head has lappets on each side, and when viewed 
beneath seems partially separated from the creeping disk, 
more like the fresh-water air-breathing snails. As they 
are best known as Vertigo, we describe them under that 
head. As the species are very minute, we have given 
not only magnified figures of the entire shell, but a still 
more magnified fram of the aperture, as the characters 
of the species lie mostly in the contour of this portion of 
the shell. 
VERTIGO ovara Say (Figs. 57, 58) has an ovate, 
dark, amber-colored, and highly polished shell. Within 
ioe ce Fig-58. the aperture are seven or 
eight teeth; these vary 
CA greatly in different speci- 
\ mens. ; 
This is the largest of 
New England Vertigos, 
though measuring only 7s 
of an inch in length, and 2; 
of an inch in breadth. It is more globose than the spoelt 
a _ to follow, and has more teeth within the aperture. This 
species is almost aquatic in its habits, living under bits of 
_ Wood and stones, in wet and soggy widens Inhabits all 
_ the Western, Middle, and Eastern States. Is common in ; 
_ New England. 
