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Upon or above the notochord; -- applied esp. to a vertebral column which develops upon the dorsal side of the notochord, as distinguished from a perichordal column, which develops around it.

the outer wall of the body, as the atrium of an amphioxus and possibly the body cavity of vertebrates.

A ventral cartilaginous or bony element of the coracoid in the shoulder girdle of some vertebrates.

lled homonymous parts; as, for example, one of the several segments of the extremities in vertebrates, or one of the similar segments in plants, such as the segments of a segmented leaf. Syd. Soc. Lex.

Arising from the neurapophysis of a vertebra.

Arising from the pleurapophysis of a vertebra. Owen.

A median bone connected with the sternum, in many vertebrates; the interclavicle.

One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoön. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans.

rmor of armadillos and many reptiles, and the shells or hardened integument of numerous invertebrates; external skeleton; dermoskeleton.

The organ of sight or vision. In man, and the vertebrates generally, it is properly the movable ball or globe in the orbit, but the term often includes the adjacent parts. In most invertebrates the years are immovable ocelli, or compound eyes made up of numerous ocelli. See Ocellus. Description of illustration: a b Con…

A simple visual organ found in many invertebrates, consisting of pigment cells covering a sensory nerve termination.

An oviparous, vertebrate animal usually having fins and a covering scales or plates. It breathes by means of gills, and lives almost entirely in the water. See Pisces.

A thick muscular stomach found in many invertebrate animals.

A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them. [Written also Gnathostomata.]

Having the limbs on, or directed toward, the ventral or hemal side, as in vertebrates; -- opposed to neuropodous.

The cold-blooded vertebrates. Same as Hematocrya.

One the above-mentioned filaments, consisting, in invertebrate animals, of a long, tubular part which is free and flexible, and a bulbous root imbedded in the skin. Then read he me how Sampson lost his hairs. Chaucer. And draweth new delights with hoary hairs. Spenser.

The cold-blooded vertebrates, that is, all but the mammals and birds; -- the antithesis to Hematotherma.

The warm-blooded vertebrates, comprising the mammals and birds; -- the antithesis to hematocrya.

The normal coloring matter of the red blood corpuscles of vertebrate animals. It is composed of hematin and globulin, and is also called hæmatoglobulin. In arterial blood, it is always combined with oxygen, and is then called oxyhemoglobin. It crystallizes under different forms from different animals, and when crystall…