28 ARIONIDA., 
or orange tint of the foot-sole is a constant diagnostic 
character of Aortensis, though it is possible to scrape off 
the slime from the foot-sole, leaving it a pallid colour. Its 
skin, as has been so often remarked, is wonderfully tough 
to crush. 
Var. I. ruféscens (Mog.). Reddish, with black bands. 
Var. Il. subfisca(C. Pfr.). Orange, with brown hands. 
Var. III. xzgra (Alog.). Black, with lateral grey bands. 
d. AR{ON circuMsScR{PTUS (danded) Johnston. 
[=ARI{ON BOURGUIGNATI Madbzle. ] 
Not so long and slender as Arion hortensis, though similarly banded. 
A dark diffused band down the centre of the back, usually divided 
in the dorsal line by a whitish line ; /oof-so/e brilliant white. Colour 
varying from white to very dark slate, with darker markings. Occa- 
sionally the markings are very faint and the animal nearly white ; 
slime milky ; dength 1 inch. 
This is a very common species throughout the British 
Isles. It is “sluggish” to the last degree, being rarely 
found on the move. 
In its habitat it frequents open fields more than gardens. 
The colour of the head and tentacles varies according 
to the colour of the animal, sometimes dark and sometimes 
light. 
Var. subfisca (Roeb.). Brownish with dark bands. 
