*Articulata. A great division of the animal kingdom, characterized generally by having the surface of the body divided into rings, called segments, a greater or less number of which are furnished with jointed legs (such as insects, crustaceans, and centipeds).
Articulation (Anat.). The joining or juncture of the bones of a skeleton.
Ascidians. A class of acephalous mollusks, having often a leathery exterior.
Biology. The science of life; that part of physiology which treats of life in general, or of the different forces of life.
Brain. The upper part of the head. 1. (Anat.) The whitish, soft mass which constitutes the anterior or cephalic extremity of the nervous system in man and other vertebrates, occupying the upper cavity of the skull; and (b) the anterior or cephalic ganglion in insects and other invertebrates.
2. The organ or seat of intellect; hence, the understanding.
3. The affections; fancy; imagination.
*Branchiæ. Gills, or organs for respiration in water.
*Branchial. Pertaining to gills or branchiæ.
*Canidæ. The dog family, including the dog, wolf, fox, jackal, etc.
Cell. A minute, inclosed space or sac, filled with fluid, making up the cellular tissue of plants, and of many parts of animals, and originating the parts by their growth and reproduction; the constituent element of all plants and animals (though not universal for all parts of such structure), much as a crystalline molecule is the element of a crystal. In the simplest plants and animals (as the infusoria), one single cell constitutes the complete individual, such species being called unicellular plants or animals.