GASTEROPODA. LIMACID. 47 
and sides sculptured with oblong subverrucose tubercles and 
confluent grooves. Foot divided from the body by a groove ; 
its sides wide. 
The Ariones were confounded with the Limaces or Slugs by 
all naturalists, until the distinctions were pointed out by De 
Férussac, in his valuable and splendid work on the Land and 
Freshwater Mollusca. 
During the day they retire into shaded places, or lurk be- 
neath the branches of trees, or under the herbage on the ground ; 
and in the evening, as well as in cloudy weather, they wander 
about in search of their food, consisting of vegetable matter, 
which they devour with great voracity. It is stated that they 
eat also putrid animal substances and excrements. Their move- 
ment is very slow. 
They have been observed to devour the mucus, secreted by 
the gland, at the extremity of their body. 
The lateral aperture contains the termination of the rectum, 
which is very near to the orifice of the respiratory sac, as well 
as the orifices of generation, which open beneath that of respi- 
ration. 
i. ARION EMPIRICORUM. Plate VIII. fig. 1-2, var. e. 
A. ater, niger, fuscus, rufescens, flavidus aut albidus, margine 
laterali concolore, luteo, coccineo aut croceo simplici, vel 
verticaliter nigro-lineato. 
Arion Empiricorum, Féruss. Hist. des Moll. i. 60. 
Var. a. Ater, niger aut fuscus, margine laterali concolore. 
Féruss. H. des M. 1. pl. 2. fig. 1. 
Limax ater, Lister, Phil. Trans. ix. p. 96 ; Linn. Syst. Nat. 
xii. i. 1081; Penn. Brit. Zool.iv.40; Drap. Hist. Moll. 
122. pl. 9. fig. 3.0 
Var. @. Rufus, aut subrufus, margine laterali concolore. 
Limax rufus, Linn. Syst. Nat. xii. i. 1081; Penn. Brit. Zool. 
iv. 40. 
Limax Empiricorum y, Féruss. H. des Moll. 61. pl. 3. fig. 2. 
Var. y. Ater aut fuscus, margine laterali coccmeo, croceo aut 
luteo, verticaliter aut obliqué nigro-lineato. 
Féruss. H. des M.i. 61. pl. 2. fig. 2. var. 6. 
