Encephala

From Ancient Greek ἐν (en, “in”) + κεφαλή (kephalḗ, “head”).

Encephala

1. (archaic) A non-taxonomic, informal classification, within phylum Mollusca - those in the classes having heads: Cephalopoda, Pteropoda and Gastropoda
   • 1854, Philip Henry Gosse, Natural History (in English), page 57:

     Naturalists arrange the Mollusca in six classes, named Cephalopoda, Pteropoda, Gasteropoda, Conchifera, Brachiopoda, and Tunicata. Of these the first three are sometimes distinguished as Encephala, or furnished with a head; the last three as Acephala, being destitute of that organ.

• Acephala

• “Encephala”, in OneLook Dictionary Search.
• “Encephala”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.