GEOGRAPHICAL DISTRIBUTION. H5 
and saturated -with water, localities not habitable by 
other genera. Helix multilineata is one of the species 
said to inhabit wet meadows. 
Elevation. Although all our species, as has been 
said, may be supposed to have surmounted very consider- 
able elevations, yet they do not constantly inhabit the 
highest levels, such positions being, by reason of climatal 
influences, less favorable to them than less elevated 
situations. There are, however, some species which, 
although diffused throughout almost every part of the 
country, are found more commonly than others, hi the 
higher regions of the mountains, and which appear to 
occupy them by choice. It would seem, therefore, that 
elevation exercises an influence independent of chmate. 
We are not aware that many facts have been observed 
which support this opinion, and the only species which 
we can mention with confidence as being frequently 
noticed in such situations is Helix inornata, which, both 
in New York, Vermont, and Massachusetts, we have 
procured from the highest ridges. This native species 
bears some resemblance to Helix alliaria, which Mr. 
Forbes cites as an inhabitant of the highest elevations 
in Great Britain. 
But, notwithstanding these remarks, the general influ- 
ence of elevation corresponds with that of increasing 
northern latitude, and is decidedly climatal. The height 
of the most elevated mountains in the United States, 
eastward of the Rocky Mountains, however, is so incon- 
siderable, that they enjoy for a short period, at least 
