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One of the corneas of a compound eye in the invertebrates. Carpenter.

ammals the red corpuscles are circular, but in the camels, birds, reptiles, and the lower vertebrates generally, they are oval, and sometimes more or less spherical in form. In Amphioxus, and most invertebrates, the blood corpuscles are all white or colorless. -- White blood corpuscles (Physiol.), rounded, slightly fl…

clude the old red sandstone of Great Britain. They contain, besides plants and numerous invertebrates, the bony portions of many large and remarkable fishes of extinct groups. See the Diagram under Geology.

The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk.

A group of wormlike invertebrates having, along the sides of the body, branchial openings for the branchial sacs, which are formed by diverticula of the alimentary canal. Balanoglossus is the only known genus. See Illustration in Appendix.

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.

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.