learned the fact, and enveloped the crustacean as he had done the
mollusk. Thirty hours sufficed to drill through the Crab's
foundation-wall, and to abstract the unguarded treasure.

Every week some rifled Trivittatum tells a new tale of his felonious
deeds.

His last feat was worthy of a cannibal, for it was the savage act of
devouring a fellow-Natica. You might suppose that in this case the
trap-like operculum would afford an easy entrance to one familiar with
its use; but, true to his secret system, the burglar broke in as
before. How did he do this? Did he abrade the stone-work with flinty
sand until a hole was worn? Did he apply an acid to the limy wall
until it opened before him? Who can find the tools of the cunning
workman, or the laboratory where his corrodents are composed?

Some rods farther south, the shore is covered with smooth stones, and
there you may find the Limpet in great numbers. Patella is the Latin
name, but children call it Tent-Shell. Oval at the base, it slopes
upward to a point a little aside from the centre.

In this locality they are small, seldom more than an inch in length.
At first, you will not readily distinguish them, they are so nearly of
the color of the stones to which they are attached. This is one of
those Providential adjustments by which the weak are rendered as
secure as the strong. Slow in their movements, without offensive
weapons, their form and their coloring are their two great safeguards.
The stones to which they adhere are variegated with brown and purple
blotches of incipient Coralline, and the shells are beautifully
mottled with every shade of those colors. Some are lilac, heightening