546 THE LAND SNAILS OF NEW ENGLAND. 
This is a very characteristic species, in outline similar 
_to Helix chersina described above, though differing in 
the coarse ribs, the reflected lip, and the peculiar teeth 
within the shell. The young shell (Fig. A is quite 
flat, with the outer whorl sharp. 
Herrx asterscus Morse. (Fig. 43.) Shell minute, 
having four rounded whorls banded by twenty-five to 
Fig. 43. thirty thin transparent prominent ribs. 
FR Spire flat; suture deeply impressed ; lip 
\\ sharp. Umbilicus quite large; color 
light-brown. Diameter one-sixteenth of 
an inch; animal bluish-white. This little species, first 
discovered in Maine by the writer, has since been found 
on the Hudson River, N. Y.; on the northern shores of 
Lake Superior; Gaspé, C. E.; and in the vicinity of 
Salem, Mass. Rev. E. C. Bolles has found it plentifully 
near Portland. It is a rare shell, and seems confined to 
wet and boggy ground, where spruce and pine is inter- 
mixed with alder. 
HELIX LINEATA Say. (Fig. 44.) Shell very small, 
discoidal, light greenish in color. Whorls four, equally 
visible on both sides of the shell, having 
a series of raised lines revolving with 
the whorls. Umbilicus wide; aperture 
narrow, on the outer wall of which are two pairs of 
minute white teeth, one pair more remote. Diameter 
one-eighth of an inch; animal white, thread-like. Inhab- 
its all the Northern States, though not common in the 
West. In New England, a very common species along 
country roadsides. 
Heux muiyutissrua Lea. (Fig. 45.) This is the 
smallest land shell in the country, measuring only six- 
hundredths of an inch. The shell is subglobose, spire 
