36 LIMACID&. 
This fine slug has a wide distribution throughout the 
British Isles as far north as Elgin. Its habitat is restricted 
to cellars and the vicinity to human habitations. Its dis- 
tinctive characteristic is the blue colour of the tentacles. 
Var. I. wiréscens (Fer.). Ofa greenish glassy appear- 
ance, usual markings scarcely visible. 
Var. Il. colubrina (Pini.). Shield and body widely 
and irregularly spotted with black. 
Var. III. suffiisa (Roeb.). Shield and body suffused 
with uniform dark tinge caused by the coalescence of the 
darker markings, shading off paler below. 
Var. IV. ruféscens (Mog.). Reddish, markings indis- 
tinct. 
Var. LV. maculéta (Kal.). Brown, with black markings. 
4. LL. MARGINATUS (4eeled) Muller. PI. 1., f. 8. 
[=L. arsorum B.-Cu.] 
Body light slate colour or pale greenish grey, having a semi- 
transparent gelatinous appearance, with two bands of dark colour 
along. each side showing a lighter ridge on the dorsal line ; waztle 
with two bands along each side and a broad suffused band down the 
centre, obtusely pointed behind ; ead pale with a dark line on each 
side coming from under the mantle along each side of the head level 
with and running along the upper tentacles which are light coloured 
and slender ; /oot-sole pale with a darker line down the centre; 
Shell solid, often a cuboidal mass; S/zze colourless; Lezgth 3 inches. 
The ‘ Tree Slug,’ as it may still be called in spite of its 
change of name for the sake of priority, is distributed 
over the whole of the British Isles as far north as 
