Cœ' cum (se' kum), a blind pouch or bag; a sac open at one end.
Cœ len te ra' ta, rather simple, sac-like animals with nettle cells in the body walls.
Co le op' te ra, beetles.
Col' o ny, a group of animals of the same kind found in one locality, usually related to each other and often actually connected.
Com men' sal ism, an association of two animals, not mutually helpful, but without injury to either.
Com pound eye, an eye made up of many simple eyes or eye elements.
Com pressed', narrower from side to side than from dorsal to ventral surface.
Con ju ga' tion, a process occurring in some one-celled animals, preceding reproduction. In this process two animals unite temporarily and exchange nuclear substance, or in some forms the two cells fuse into one. After this exchange or fusion fission occurs, usually more rapidly than before.
Contracting or pulsating vacuoles, small, clear spots in a cell, filled with a watery fluid. In the living animal these alternately disappear and then reappear.
Co' nus ar te ri o' sus, a cone-shaped artery connected with the ventricle of the heart.