68 LIMN^AD^. 



L. TRUNCATULUS. MulUr. PI. VII, fig. 35. 



Shell elongated, conic oval, perforated ; spire long and consisting of 

 six deeply divided volutions. 



Helix fossaria, Mont. Limneus miniitus, Pfeif., Sfc. 



The smallest of the Limnmi, seldom attaining half- 

 an-inch in length and three lines in breadth, of a pale 

 horn colour, smooth and glossy. In shape it resembles 

 palustris, but is much smaller and has the volutions 

 rounder and more deeply and abruptly divided. They 

 are extremely variable in size, according to the locality 

 in which they are found. Animal of a light or dusky 

 grey. 



Hah. On the margin of muddy streams, in marshy 

 places, &c., often covering itself with a coating of mud, 

 probably for the twofold purpose of retaining the 

 moisture and protecting it from observation. Generally 

 diffused throughout the British Isles, and common in 

 many places. 



L. GLABER. Muller. PL VII, fig. 86. 



Shell elongated, cylindrical, tapering ; whorls rounded ; aperture 

 elongate, ovate, small. 



Helix octanfracta, Mont. Limneus elongatus, Drap. 



Shell longer than truncatulus and more gradually 

 tapering, thin, glossy, and horn coloured, but often 

 covered with a dark epidermis. Whorls seven or eight 

 in number, and varying much in convexity ; suture 

 profund, slanting ; body whorl not quite so long as the 

 spire. About three quarters of an inch in length, by 

 one quarter in breadth, but varies much in size. Ani- 

 mal blackish or dusky. 



Hah. This shell is widely diffused, but rather 

 local, and by no means abundant ; it inhabits ponds or 

 ditches of stagnant water, in Wilts, Somersetshire, 

 Staffordshire, near Pontefract, York, and many 

 parts of Yorkshire, Durham, and Northumberland ; 

 probably more common in the north than the south of 

 England. 



