stee. The term, principally
owing to its cumbersomeness, is being gradually superseded in modern law
by that of "beneficiary." _Cestui que use_ (sometimes _cestui a que
use_) means "the person for whose benefit a use" is created (see TRUST).
_Cestui que vie_ is "the person for whose life" lands are held by
another (see REMAINDER).

CETACEA (from the Gr. [Greek: ketos], a whale), the name of the
mammalian order represented by whales, dolphins, porpoises, &c. From
their fish-like form, which is manifestly merely an adaptation to their
purely aquatic life, these creatures are often regarded as fishes,
although they are true mammals, with warm blood, and suckle their young.

The general form is essentially fish-like, the spindle-shaped body
passing anteriorly into the head without any distinct neck, and
posteriorly tapering gradually towards the extremity of the tail, which
is provided with a pair of lateral, pointed expansions of skin supported
by fibrous tissue, called "flukes," forming a horizontal triangular
propelling organ, notched behind in the middle line. The head is
generally large, in some cases attaining more than one-third the entire
length; and the mouth is wide, and bounded by stiff, immobile lips. The
fore-limbs are reduced to flattened paddles, encased in a continuous
skin, showing no external sign of division, and without trace of nails.
There are no signs of hind-limbs visible externally. The surface of the
skin is smooth and glistening, and devoid of hair, although in many
species there are a few bristles in the neighbourhood of the mouth which
may persist through life or be present only in the young state.
Immediately beneath the skin is a thick layer of fat, held together by a
mesh of tissue, constituting the "blubber," which retains the heat of
the body. In nearly all species a compressed dorsal fin is present. The
eye is small, and not provided with a true lacrymal apparatus. The
external ear is a minute aperture in the skin situated at a short
distance behind the eye. The nostrils open separately or by a single
crescentic aperture, near the vertex of the head.

The bones generally are spongy in texture, the cavities being filled
with oil. In the vertebral column, the cervical region is short and
immobile, and the vertebrae, always seven in number, are in many
species more or less fused together into a solid mass. The odontoid
process of the second cervical vertebra, when that bone