The Sepia. 
535 
rougher and stronger than that of the Snail. Its pro- 
gress on the ground may easily be traced by the slime 
which it leaves in its track. Few animals are more 
destructive to vegetation than these. 
THE BLACK SLUG, {Avion ater,) 
Is a well-known inhabitant of our fields and meadows, 
during the summer season. The country people con- 
sider its appearance as an indication of approaching 
rain ; but this is rather to be accounted for by the 
moisture of the ground and plants. Indeed, it very 
seldom appears abroad during dry weather. The Black 
Slug feeds on the leaves of different kinds of plants. 
THE SEPIA, OR CUTTLE-FISH. (Sepia officinalis.) 
The structure of these animals is very remarkable. 
Their body is nearly cylindrical, and, in some of the 
