THE MOLLUSCA. 135 



it varies in colour according to locality. It is found in 

 woods, of many colours white, yellow, orange, and 

 reddish brown. It is essentially a vegetable feeder, but 

 will sometimes regale itself with a dead worm. It has no 

 distinct shell. 



Limax agrestis (Milky Slug). A small dark, or reddish grey, 

 and voracious vegetable feeder ; common in fields, upon 

 hedge-banks, and in gardens. The shell is a small 

 squarish oval, white, calcareous plate, slightly convex 

 above, situated underneath the skin of the shield, a little 

 behind the head. The animal, when extended, measures 

 from an inch to an inch and a half in length, and when 

 irritated pours out a white milky fluid from the pores all 

 over its body. 



Limax dnereus. Not so common as the preceding; found 

 amongst grass in damp situations, under logs of wood, 

 about outhouses and gardens. It is a large, dark grey 

 slug, sometimes nearly black, measuring from three to 

 five or six inches long, and proportionately bulky; the 

 back and tail coarsely wrinkled, and the mucus colourless. 

 The shell is internal, from a quarter to half an inch long, 

 half that width, slightly convex, rather pearly white, and 

 sometimes tinged 1 with pink. 



HELICID/E. 



Vitrinapellurida (Transparent Glass-bubble). Small, extremely 

 thin and transparent, very highly polished, and of a pale 

 watery green colour. Not uncommon amongst moss and 

 under stones upon the Birkdale sandhills. 



Zonites alliarius (Garlic Snail). Found under stones upon the 

 sandhills, but rather rare. About a quarter of an inch in 



