ARION. 25 
2. AR{ON SUBFUSCUS (somewhat tawny) Draparnaud. 
Body grey or tawny yellow, with one longitudinal dark band on 
each side, and often a diffused band down the suture 5 #zantle granu- 
lated, coloured and banded similarly to the body ; vzgosz¢zes shorter 
and less prominent than in 4rzov ater ; fringe white with dark cross- 
streaks ; foot-sole white ; s/ime yellow or orange ; she// none ; length 
2 to 3 inches. | 
The above description is that of a typical subfuscus, 
but we meet with bandless examples, and others in which 
the bands are all diffused into one broad dark patch over 
the body and mantle, extending to the lower edge of the 
lateral bands. 
This species is most probably what English concho- 
logists have called Arion flavus. 
It is intermediate in size between Avion ater and Arion 
hortensis. When the bands are present it need not be 
confused with a colourless form of Avion ater, which is 
extremely rarely banded; nor need it be mistaken for 
Arion hortensts, which always has a yellow or orange 
foot-sole, that of Avion subfuscus being invariably white. 
It has a wide distribution throughout the whole of the 
British Isles, but it is never very abundant. 
It is found in the open country, and Mr. Roebuck 
informs me that it occasionally frequents pine woods and 
heather-covered moors. 
The colouring is due to the slime which contains the 
pigment and comes off the animal on to the fingers like 
paint. 
