Lamarck's Genera of Shells. 241- 



9, SUCCINEA *. 



Shell oval, or ovate-conical. Aperture large, entire, longitu- 

 dinal ; right margin sharp, not reflected; united at the lower 

 part to a smooth, attenuated, acute columella. No operculum. 

 The Succinete live habitually on land, in the neighbourhood 

 of water, which they occasionally frequent. They are distin- 

 guished from the bulirai, by the right margin never being re- 

 flected, and from the lymnsese, by their columella being free 

 from folds. 



Type. Succinea amphibia ■\. (Helix putris. Linn.) 

 Shell ovate-oblong, very thin, transparent, yellowish ; spire 

 short; aperture dilated, at the lower part, subvertical. France, 

 PI. VII. Fig. 138.— 3 Species. 



10. Auricula %• 

 Shell suboval, or oval oblong. Aperture longitudinal, very 

 entire at the base, contracted at the upper part, where the mar- 

 gins are disunited. One or more folds on the columella. Lip 

 sometimes reflected outwards, sometimes simple and sharp. 



Land-shells, and distinguished from bulimus, by the folds on 

 the columella. The genus is subdivided into (1,) those with 

 the right margin reflected outwards — 10 species ; and (2) those 

 with the margin simple and sharp— 4 species. 



Type. Auricula Midce §. (Voluta auris Midse. Linn.) 

 Shell ovate-oblong, very thick, decussately striated, granular 

 above, white ; chestnut brown epidermis ; spire short, conoidal ; 

 middle of the aperture contracted ; columella biplicate. 

 East Indies. PL VII. Fig. 1 39.— 14 Species. 



11. Cyclostoma (|. 

 Shell of variable form ; sometimes subdiscoidal, sometimes 

 conical, or turrited, or subcylindrical. Whorls of the spire 

 cylindrical. Aperture round, regular ; margins circularly united» 

 open, or reflected by age. Operculum horny. 



Land-shells, never pearly, generally thin, and without squamsc 

 Of tubercles on the outside, distinguished from the paludinai 



* Amba-- coloured. t Amphibious. J A little car. 



§ Midas's. II KunXo;, a circle, and a-ls/^a, a mouth. 



R 2 



