262 MOLLUSCA. 
CHAPTER XVIII. 
MOLLUSCA., 
HELIX. ANODON. SEPIA. 
I.—_ HELIX. 
PHYLUM MOoLtusca (p. 282). 
CLass GASTROPODA (p. 283). 
Fig. 184.LaTERAL VIEW OF THE ROMAN SNAIL (Heléx pomatia). 
Natural size. 
Ocular 
Tentacle. 
Note_the creeping”foot, spiral shell and head with tentacles. 
Helix pomatia (the edible or Roman snail) is slightly 
larger than Helix aspersa (the garden snail) and more con- 
venient for dissection. It does not differ in 
essential features. The body is of a dark 
greenish-slate colour, and the shell of a uniform pale drab. 
The snail is a vegetable-eater and mostly nocturnal in its 
habits. It hibernates in the winter, when it closes up the 
Habits." 2perture of the shell by an epiphragm of chalky 
j "™ matter and hardened mucus. It is in most 
features a plano-symmetric’ animal but its symmetry is in 
Colour. 
