118 



spire composed of four volutions, the three termi- 

 nal ones very small : aperture vast somewhat oval, 

 with the outer lip expanded ; pillar with a strong 

 fold, the lip reflected and forming a slight hollow 

 behind it. 



In stagnant and slow waters. 



101. LiMNEus pereger. Shell ventricose, more or 

 less striate, with a moderately short acute spire. 



Limneus pereger. Drap. p. 50. t. 2.f. 34 — Q7. 

 Lymnaea peregra. Lamarck, vi. n. p. 161. 

 Gulnaria peregra. Leach, Mollusc, p. 146. 

 Helix peregra. Mont. p. 373. t. 16. f. 2. 

 Helix putris. Turt. Diet. p. 67. 



b. with the aperture more dilated. 



Limneus ovatus. Drap. p. 50. t. 2./. 30, 31. 

 Lymneus ovatus. Brard, p. 142. t. 5.f. 4, 5. 

 Lymnaea ovata. Lamarck, vi. ii. ^. 161. 

 Helix limosa. Mont. p. 381. f. 16./. 1. 



c. the sheU thicker, and the outer lip not at- 

 tenuated. 



Helix lutea. Mont. p. 380. t. 16. f. 6. 



d. with regular longitudinal grooves. 



