ARION. 43 
1, A. AreR (black). 
Body rounded in front, tapering behind ; colour exceed- 
ingly variable, black, chocolate, reddish, yellowish, green- 
ish, and whitish; coarsely tuberculated; mantle finely 
shagreened ; shell usually absent, though occasionally re- 
presented by a few granules. 
The great variations in the colour of this common 
slug do not appear to have much, if anything, to do with 
its habitat. The common type, coal black, from which 
it derives its specific name, is found in the same locali- 
ties as beautiful cream-coloured specimens with dark 
tentacles and a yellow fringe. In Berkshire this 
variety is common, as also chocolate-coloured speci- 
mens. In the Isle of Man I once found a piebald 
specimen. In Ireland I have met with individuals of 
a bright yellow, and some of a gorgeous pink tint. 
A few granules, only found in some specimens, re- 
present the aborted shell. In chalky districts, how- 
ever, some have a thick lump of nacreous matter under 
the mantle. 
2. A. FLAvus (yellow). 
This species is not so large as the last, averaging 
three inches in length, but the tubercles of the body 
are larger in proportion. It is of a yellow colour and 
has a wide range. There is no shell. 
