154 
HELICIB^. 
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 
