( 48 ) (Helix, Fer.) 



\A. Cochlodina. Fer. 

 Clausilia. Drap. Vol- 

 vulus. Ocken. 



Cylindrical or fusiform; Columella solid, often A pedunculated elas- 

 whorls equal, numerous, with plates. - tic operculum, 



narrow; mouth generally 

 with elevated plates, and 

 always wth one or two 

 gutters. 



a Pupoides. Mouth without teeth or plates; peristoma not continuous. 



b { lydostom^Lam. } Peristoma continuous. PI. 8, fig. 31. 



c { Pupa"^/,. } Mouth ™ thout P lat es. PL % fig- 29. 

 d Clausilia, Drap. Mouth with plates. PI. 6 ; fig. 36. 



15. Vertigo. Muller. 



Cylindrical, very spi- Peristoma often sinuous 

 ral ; volute increasing and reflected, 

 gradually ; mouth narrow, 

 short in the direction of 

 the axis, often dentated. 



a Mouth not dentated. PI. 8, fig. 34. 

 b Mouth dentated. PI. 8, fig. 35, 36. 



16. Partula. Fer. 



Oval, pointed ; spire Columellar side callous 

 conical ; last whorl gib- at base, 

 bous and longer than all 

 the others together ; mouth 

 short in the direction of 

 the axis, sometimes den- 

 tated or with elevated 

 plates ; peristoma general- 

 ly much reflected. PI. 8, 



\ 



