LIMN^EUS. 69 



L. PALUSTRIS. Linnaeus. PL VII, fig. 39. 



Shell ovate, oblong, spire tapering, of a purplish raw-umber colour ; 

 aperture ovate about the same length as the spire. 



Helix palustris, GmeL, fyc. 



This shell varies very much in size, shape, and 

 colour, but cannot well be confused with any other 

 species. It is generally an inch or more long and half- 

 an-inch broad. Whorls seven, hardly raised, but 

 divided by a distinct oblique suture. Aperture about 

 half as long as the shell, of a chocolate colour inside ; 

 outer lip regularly arched. Animal dusky grey, tinged 

 with olive. 



Hob. Stagnant waters, with muddy bottoms, in 

 most parts of the British Isles, and found more abun- 

 dantly than the three preceding. 



L. GLTJTINOSUS. Muller. PL VII, fig. 32. 



Shell subglobose, thin and transparent, finely wrinkled ; of a pale 

 amber colour, spire very small ; aperture large. 



Helix glutinosa, Mont. Amphipeplea glutinosa, 

 Gray. 



The shell of this species is extremely thin and 

 highly polished. The spire is much depressed, con- 

 sisting of three whorls ending obtusely ; the body 

 whorl is remarkably large, forming a capacious mouth, 

 extending almost the whole length of the shell, which 

 is ovate but acute above. About half-an-inch in length 

 and three eighths in breadth. Animal large, of a pale 

 dull yellow colour, with brighter spots ; mantle lobes 

 dilated ; tentacles broad and flat. 



Hob. This shell is rare, though at times rather 

 plentiful where it occurs. The south eastern counties, 

 the Cherwell, Oxfordshire, Lake Windermere, &c., are 

 recorded localities. It seems to prefer deep and still 

 waters. 



L. INVOLUTUS. Harvey. PI. VII, fig. 33. 



Shell ovate, thin, transparent ; spire flat, consisting of three or four 

 volutions ; aperture large, pear shaped. 



