154 HELICIDJ2. 



white longitudinal streaks ; spire consisting of from 

 nine to twelve somewhat rounded volutions, ending 

 rather acutely ; aperture oval, longer than wide ; the 

 peristome reflected and forming a slight perforation 

 at the pillar. 



This shell varies very greatly in its colour, being 

 sometimes nearly white without bands, and at others 

 variously banded ; the hinder bands are often want- 

 ing or interrupted, and sometimes instead of being 

 banded, the shell is marked with oblique longitudinal 

 streaks, sometimes the black and sometimes the white 

 being the more abundant, and consequently forming 

 the ground colour. It varies slightly in shape, and 

 is sometimes much elongated. 



M. Moquin Tandon describes the anatomy of this 

 animal as similar to that of Helix, and regards it as a 

 Helix with an elongated turreted spire. 



In the places where it is found it is often so 

 abundant that it is a prevailing opinion that they 

 contribute much to the fattening of sheep. (See 

 Borlase, Hist. Corn. 286. ; Mont. Test. Brit. 347.) 

 It is often found in company with Helix virgata (see 

 Test. Brit. 417.), which is supposed to have the same 

 qualities. 



7. ZUA Leach. (Varnished Shell.) 



Animal like Bulimus, with an ovate subcylindrical 

 rather blunt shell, covered with a smooth 

 polished periostracum ; mouth ovate, thickened, 

 and united all round ; peristome toothless ; axis 

 imperforated. 



This genus is easily known from Bulimus by the 

 lished periostracum, and continued, thickened, not 



