117 



XXII. LIMNEUS. 



Shell regular, spiral, oblong, thin and transparent, 

 with a single oblique plait or fold in the middle 

 of the pillar : aperture oblong, with the outer lip 

 acute, rounded and entire at the base, the peri- 

 treme interrupted : operculum none. 



j" with the spire not so long as the aperture. 



100. LIMNEUS auricularius. Shell extremely infla- 

 ted, striolate with a very short acute spire : aper- 

 ture oblique, vastly expanded and roundish-oval. 



Limneus auricularius. Drap.p. 49. t. 2.f. 28, 29, 



32. 



Lymnaea auricularia. Lamarck, vi. ii. p. 161. 

 Lymneus auricularius. Brard,p. 140. t. 5.f. 2, 3. 

 Radix auriculatus. De Montfort, ii. p. 207. 

 Gulnaria auricularia. Leach, Mollusc, p. 148. 

 Helix auricularia. Mont. p. 375. t. 16. /. 2. 



b. regularly striate longitudinally. 



Shell an inch long, and three quarters wide, thin, 

 brittle, transparent, of a light yellow horn-colour, 

 more or less distinctly striate longitudinally : 



