Encyclopædia Britannica, Ninth Edition/Acephala

For works with similar titles, see Acephala.

​Acephala, a name sometimes given to a section of the molluscous animals, which are divided into encephala and acephala, according as they have or want a distinctly differentiated head. The Acephala, or Lamellibranchiata as they are also called, are commonly known as bivalve shell-fish.

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