Univalve (L. unus, one; valvæ, doors). A shell composed of one calcareous piece, as the Periwinkle.
Umbones. The base of a shell about the hinge.
Viviparous (L. vivus, alive; pario, I bring forth). The animals which bring forth their young alive. See Oviparous.
Whorl. The spiral turn of a shell.
Zoology (Gr. zoon, animal; logos, a discourse). That branch of science that treats of the habits, structure, and classification of animals.
Zoologist. One who is acquainted with the science of Zoology.
Zoophyte (Gr. zoon, an animal; phyton, a plant). The lowest primary division of the animal kingdom, which includes many animals that are fixed to the ground and have the form of plants.