placophora

Century Dictionary and Cyclopedia

1. In Gegenbaur's system of classification, one of two primary divisions of the Mollusca, consisting of the chitons only. The Polyplacophora and Amphomœa of Lankester, though of a very different taxo-nomic grade, are conterminous. See Polyplacophora, and cut under Chitonidæ.

GNU Webster's 1913

1. n. (Zoöl.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under chiton, and isopleura.