encephala

from The Century Dictionary.

• noun Plural of encephalon.
• In zoology: In Haeckel's classification, a group of molluscous or soft-bodied animals, composed of the snails (Cochlides) and cuttles (Cephalopoda): one of his two main divisions of Mollusca, the other being Acephala, or the brachiopods and lamellibranchs.
• As used by E. R. Lankester, a prime division or branch of the Mollusca, represented by two series, Lipoglossa and Echinoglossa, as together contrasted with Lipocephala. The Encephala in this sense contain the gastropods, cephalopods, pteropods, and other forms.
• A group of mollusks including those which have a head. Synonymous with Cephalata or Cephalophora (which see): distinguished from Acephala.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Plural form of encephalon.
• noun Plural form of encephalum.