74 LIMAX TENELLUS. 
half-grown; about July they appear above ground and feed upon the fungi, 
which at that period begin to flourish, the appearance of the slug being 
coincident with and dependent on the development and growth of the fungi 
upon which it feeds. 
When young, the animals are almost unicolorous, and may then easily 
be confused with pale A griolimax levis or A. agrestis, but the polygonal 
reticulation of L. agrestis and the brownish tentacles of Z. davis aid us in 
their separation. 
heir unicolorous state may be continued to adult life, but usually when 
about half-grown they acquire on each side of the mantle a brownish or 
black zone, which may later assume a lyre-shape. The inner side of this 
dark marking has a pale margin, and this gives rise to a darker median 
patch which when well defined assumes somewhat the shape of a hour-glass. 
The mantle-band may occasionally extend to the body as a faint longi- 
tudinal zone. In addition there is a pale mid-dorsal or keel streak, which 
is quite broad at its origin, gradually narrowing, but widening again before 
finally contracting as it approaches the tail, “which in young ‘animals is 
tinged with a delicate carmine. 
Variation.—Limax tenellus is not a very variable species, but there 
appear to be some differences recorded in the fundamental body-colour, 
and in addition there may be distinct lateral banding on the shield, which 
may extend upon the body also. 
Dr. Westerlund, in his Fauna Europe, 1876, p. 11, gives as a variety of 
this species the Limawx squammatinus of Morelet, but this is really a species 
of Geomalacus. 
According to Dumont & Mortillet’s observation upon Limaa sylvaticus, 
which Lessona & Pollonera allocate with L. tenellus, the banded variety is 
more especially an inhabitant of the mountains and ‘exposed situations, the 
unicolorous form being more characteristic of the lower lands and umbra- 
geous places; these features do not appear to be so well marked in their 
German habitats. 
Var. eerea Held, Land Moll. Bayern, 1849, p. 15. 
Limax syluaticus var. immaculatus Dum. & Mortil., Mal. Savoie, 1857, p. 11. 
ANIMAL of a somewhat uniform waxy-yellow colour, with only faint traces of 
lateral banding. 
According to Dr. Westerlund the Limax wanthius Bourg., from Malberg, near 
Ems, in Germany, is an unicolorous yellowish variety of this species, and is prob- 
ably referable to the var. cerea. 
This form is also found at Augsburg, Munich, and on the mountains of the 
Traunstein, Bavaria; the Erzegebirge, and at Konigstein in Saxony, and if the 
reference by Lessona & Pollonera be correct, is also met with in Savoy, where it 
was recorded by Dumont & Mortillet as LZ. sy/vaticus var. imimaculatus. 
The British and Scandinavian examples would appear to belong to this variety, 
as they are recorded as possessing only a slight lateral shading. 
Var. fulva Normand, Desc. Limac. Nouvy., 1852, p. 7 
Limax Julvus Normand, op. cit. 
ANIMAL reddish-brown, suffused dorsally with black ; SHIELD reddish-brown, 
scarcely obscured by some small pulviform blackish spots ; tentacles vinous-brown ; 
locomotory mucus colourless ; BODY mucus yellow. 
This variety, or geographical race, which was confused with L. arborwm until 
shown by Simroth to be a form of L. tenedlus, has been found at Valenciennes, in the 
department of the Nord, by Normand; in the Forest at Saint-Saulge, in the Niévre, 
by Breviére; in the Forest of Hez, in the Oise, by Dr. Baudon ; in the neighbourhood 
of Dijon, in the Cote @Or, by Dronet ; and at Luxembourg, in the departmeat of 
the Seine, by M. Rétout. 
