The Common Snail. Al 
but which it can scarcely be suspected of having 
hollowed out for its own accommodation. Fig. 5, 
the Elegant Cyclostome (Cyclostoma elegans). On 
turning to the dictionary, we find that cyclos- 
tomous means having a circular mouth. This 
species is sometimes called Turbo elegans; the 
beautifully-marked shells are often found in 
chalky hills covered with brushwood. This pretty 
mollusk has a curious mode of travelling; the 
under surface of the foot, which is long, is divided 
by a deep fissure into two narrow strips, like 
ribbons; these take hold of whatever the creature 
may be moving on alternately; one keeping fast 
hold while the other advances, in like manner to 
fix itself, and drag the body forward. Fig. 6, 
the Undulated Plekocheilos (P. wndulatus); the 
Latin plecto—to twist or twine, seems to be the 
root from which the generic name of this Snail 
is derived ; the specific name will be easily under- 
stood; to undulate, is to flow like waves, and the 
lines on the shell it will be seen are undulating. 
This is not a British species, but is introduced 
here to give variety to the group; it is a West 
Indian Mollusk, and is found in immense numbers 
in the forests of St. Vincent; it glues its eggs to 
the leaves of a plant which holds water, and thus 
