124 CATALOGUE OF THE MOLLUSCA 
3. Blackish above, with a black band on each side of the 
body, and the sides yellowish white. 
4. Yellowish or greenish white, with black tentacles. 
The young are always much paler than the adults, and are 
sometimes of a transparent white. We have not met with the 
rufous variety in this district. 
2. A. FLavus, Mull. 
Arion flavus, Fér. Hist. des Moll. Supp. 96; Bouchard 
Chantereaux Cat. des Moll. du Pas-de-Calais, 23. 
Limax flavus, var. y, Nilsson Moll. Suec. 5. “ Pallidus, 
clypeo flavo, dorso sub-cinerascente.” 
The variety has once occured to us ; found on the moors near 
Haltwhistle by Mr. J. Blacklock. 
M. Bouchard Chantereaux considers this species distinct from 
A. ater, and it has not the characters of the latter pointed out by 
Ferussac ; but we know too little of it to give a decided opinion 
in so difficult a genus. Our individual was about an inch in 
length, with the body whitish, having a faint greyish tinge above. 
The shield and the posterior part of the body near the tail were 
of a pale canary yellow. Tentacles, grayish white. The mucus 
was deep orange-yellow. The mucus of A. ater is colourless or 
very faintly tinged with yellow. 
3. A. HorTENsis, Jér. 
Arion hortensis, var. 2, Gray Turt. Man. 107. 
Limax fasciatus, Nilsson Moll. Suec. 3. 
Limax circumscriptus, Johns. in Edinb. Phil. Journ. v. 77. 
In gardens, common. 
A variety, or, as we are inclined to think, a species nearly al- 
lied to this, is found in woods. It is about twice the size of the 
garden slug, and its colour invariably yellowish fawn, inclined 
to amber, with a brown band on each side. We have never 
found the two kinds mixed, the one inhabiting woods, and the 
other cultivated grounds. This variety, we find, is well known 
to the Rev. B. J. Clarke, who also finds it constant in colour and 
markings. The mucus is orange yellow. 
