13. The sixth and last class of animals consists of WORMS, or vermes. These
are slow of motion, and have soft and fleshy bodies. Some of them have hard
internal parts, and others have crustaceous coverings. In some of the
species eyes and ears are very perceptible, whilst others appear to enjoy
only the senses of taste and touch. Many have no distinct head, and most of
them are destitute of feet. They are, in general, so tenacious of life,
that parts which have been destroyed will be re-produced: These animals are
principally distinguished from those of the other classes by having
tentacula, or feelers.
14. Some late writers have divided the worms into three or more distinct
classes; but the Linnæan division is into five ORDERS.