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A shark of the genus Cestracion, and of related genera. The posterior teeth form a pavement of bony plates for crushing shellfish. Most of the species are extinct. The Port Jackson shark and a similar one found in California are living examples.

ving the anterior pair of wings (elytra) hard and horny, and serving as coverings for the posterior pair, which are membranous, and folded transversely under the others when not in use. The mouth parts form two pairs of jaws (mandibles and maxillæ) adapted for chewing. Most of the Coleoptera are known as beetles and we…

f the occipital bone; -- sometimes called the anterior condylar foramen when a second, or posterior, foramen is present behind the condyle, as often happens in man.

An order of lamellibranchiate mollusks having an anterior and posterior adductor muscle, as the common clam. See Bivalve.

optera and some other insects, when they are thick and serve only as a protection for the posterior pair. See Coleoptera.

cts, including the earwig. The anterior wings are short, in the form of elytra, while the posterior wings fold up beneath them. See Earwig.

A small beetle of the family Halticidæ, of many species. They have strong posterior legs and leap like fleas. The turnip flea- beetle (Phyllotreta vittata) and that of the grapevine (Graptodera chalybea) are common injurious species.

tage or pier which rises and falls with the tide. -- Floating ribs (Anat.), the lower or posterior ribs which are not connected with the others in front; in man they are the last two pairs. -- Floating screed (Plastering), a strip of plastering first laid on, to serve as a guide for the thickness of the coat. -- Flo…

A small fold of membrane, connecting the labia in the posterior part of the vulva.

One of the two prominences at the posterior extremity of the frog of the horse's foot.

grayish mottled appearance, with blue tubercles on the anterior and red tubercles on the posterior part of the body, all giving rise to long yellow and black hairs. They usually pupate in July and the moth appears in August. The eggs are laid on tree trunks, rocks, etc., and hatch in the spring.

Having five tarsal joints in the anterior and middle legs, but only four in the posterior pair, as the blister beetles and oil beetles.

The posterior of the three principal divisions of the brain, including the epencephalon and metencephalon. Sometimes restricted to the epencephalon only.

The posterior part of the alimentary canal, including the rectum, and sometimes the large intestine also.

Having a single series of large scutes on the posterior side of the tarsus; -- said of certain birds.

An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called also aftershaft. See Illust. of Feather.

A process on the posterior side of the tarsometatarsus of many birds; the calcaneal process. -- Hy`po*tar"sal, a.

The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.

A black, two-horned, African rhinoceros (Atelodus keitloa). It has the posterior horn about as long as the anterior one, or even longer.

most insects. It often consists of a thin anterior part (ligula or palpiger) and a firmer posterior plate (mentum).