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A grand division of birds, including all existing flying birds; -- So called from the carina or keel on the breastbone.

An order of sponges in which the skeleton consists of horny fibers. It includes all the commercial sponges.

A genus of fossil corals, common in the lower Silurian limestones.

Bearing setæ.

A marine fish of the family Chætodontidæ. The chætodonts have broad, compressed bodies, and usually bright colors.

Of or pertaining to the Chætognatha.

An order of free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head.

Pertaining to the Chætopoda. -- n.

A very extensive order of Annelida, characterized by the presence of lateral setæ, or spines, on most or all of the segments. They are divided into two principal groups: Oligochæta, including the earthworms and allied forms, and Polychæta, including most of the marine species.

The arrangement of bristles on an insect.

An order of birds, including the swans, ducks, geese, flamingoes and screamers.

A cartilaginous fish of several species, belonging to the order Holocephali. The teeth are few and large. The head is furnished with appendages, and the tail terminates in a point.

Related to, or like, the chimæra.

A disease characterized by severe nervous symptoms, dependent upon the presence of the constituents of the bile in the blood.

See Bilirubin.

A suborder of Arachnoidea, including the European tarantula and the wolf spiders (Lycosidae) and their allies, which capture their prey by rapidly running and jumping. See Wolf spider.

A secret society of Irish Fenians founded in Philadelphia in 1881.

A genus of climbing plants, native of Mexico and South America. C. scandens is a consrvatory climber with large bell-shaped flowers.

An order of birds, including the pigeons.

A large family of dicotyledonous plants, having their flowers arranged in dense heads of many small florets and their anthers united in a tube. The daisy, dandelion, and asters, are examples.