44 ZONITIDA. 
but the shell is very uniform. I have, however, a speci- 
men taken in the north of Ireland with two milk-white 
bands running in a spiral direction from apex to mouth. 
Under a lens, or even with the naked eye, the operation 
of breathing can be well observed. In autumn, winter, 
and early spring, especially after rain, our little friend is 
abroad on dead leaves and among moss. 
Var. I. depresstiuscula (Jeff). Oval and flatter on both 
sides. 
Var Ag: dillwuynit (/ef.). Globular, spzve produced. 
Family.—ZONITID. 
Genus.—HVvA.inia Agassiz. 
[= ZonitEs De Montfort. | 
The identification of the different species of this inter- 
esting genus (the Zozztes of our youth) often gives more 
trouble to the novice—to whom they all look pretty much 
alike—than all the rest of the British land and freshwater 
shells put together, except the vexatious Pistdia. To 
simplify matters for the beginner I have framed a synop- 
tical table of comparison of those species most liable to 
be confused (see Z. 43). Young specimens of some of the 
larger species require care lest they be mistaken for adult 
specimens of some of the smaller ones, and vice versa. 
For instance, the young of z7¢é7da are apt to be mistaken 
for adult examples of zadiatula, and the young zztdula 
for adult fuva. It is a good plan in such cases to count 
