Numerous species resemble pearly or opaline cups or vases, fringed round
the margin with delicate fibres, that are in constant oscillation. Some
of these are attached by spiral tendrils; others are united by a slender
stem to one common trunk, appearing like a bunch of hare-bells; others
are of a globular form, and grouped together in a definite pattern, on a
tabular or spherical membranous case, for a certain period of their
existence, and ultimately become detached and locomotive, while many are
permanently clustered together, and die if separated from the parent
mass. They have no organs of progressive motion, similar to those of
beasts, birds, or fishes; and though many species are destitute of eyes,
yet possess an accurate perception of the presence of other bodies, and
pursue and capture their prey with unerring purpose.

[Illustration: FOOT OF COMMON HOUSE-FLY.]

[Illustration: HAIR, GREATLY MAGNIFIED.
A. Hairs of the Bat.
B. Of the Mole.
C. Of the Mouse.]

_Mantell's Thoughts on Animalcules._

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THE CANARY.