AIR-BREATHERS 119 
Several species of the genus Zonites now follow 
in our train of study. They are all small, having 
spiral shells, usually with rounded whorls and an 
open umbilicus. 
Zomtes cellarius, Miull., the Cellar Zonite, is a 
Kuropean species, but it has become widely dis- 
tributed, even on the Pacific Coast. The shell is 
very much depressed, thin, fragile, and pellucid; 
the epidermis is greenish yellow, polished, and the 
base is rounded. The little snail which inhabits 
this shell is of a light blue color, very pretty, and 
quite active. It is a snail that follows eiviliza- 
tion, and delights to live in cellars and damp places 
about buildings. The diameter of the shell is from 
6 to 12mm. The larger variety is classed by some 
as Zonites draparnaldi, Beck. 
Zonites arboreus, Say, the Bush Zonite, has a 
spire of four or five whorls, so much flattened that 
the shell appears nearly like a circular disk. Shell 
smooth, amber-colored, very thin and almost trans- 
parent. Its diameter is 3 to 4mm. This species, 
which hides under leaves and among bushes, in- 
habits many parts of North America. 
Zonitoides pu- 
geténsis, Dall, 
the Seattle Zon- 
ite, is represent- 
ed in Figure 
101, very great- 
ly enlarged, the 
real diameter 
being only 1.5 Fig. 101, x Tf @) 
