77 



XII. BULIMUS. 



Shell regular, oblong : the spire produced and ending 

 rather acutely, with the ultimate volution larger 

 than the next : aperture oval, entire at the base, 

 without teeth, not half as long as the spire ; the 

 peritreme interrupted : operculum none. 



This family is distinguished from the Limneus in 

 wanting the oblique fold on the pillar ; from the 

 Clausilia in being regular, and in having the peri- 

 treme simple and interrupted ; and from the Pupa 

 in having the spire regularly tapering. 



* pupa edentula : pupa umbilicata. 



60. BULIMUS decollates. Shell oblong conico-cylin- 

 drical, with the spire abruptly truncate : umbilicus 

 none. 



Bulimus decollatus. Drap. p. 76. t. 4./. 27, 28. 

 Helix decollata. Linn. Syst. p. 1247. 



Shell an inch long, and hardly half as much wide, 

 white, glossy, slightly striate longitudinally but 

 more regularly towards the sutures ; spire com- 



