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One of the Acephala.

That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.

Same as Acephal.

A fabulous people reported by ancient writers to have heads.

One who acknowledges no head or superior. Dr. Gauden.

A larval entozoön in the form of a subglobular or oval vesicle, or hy datid, filled with fluid, sometimes found in the tissues of man and the lower animals; -- so called from the absence of a head or visible organs on the vesicle. These cysts are the immature stages of certain tapeworms. Also applied to similar cysts o…

Pertaining to, or resembling, the acephalocysts.

Wanting the beginning. A false or acephalous structure of sentence. De Quincey.

Large headed; -- applied to animals, and to plants when they have large flower heads.

Having a head; -- said of most Mollusca; -- opposed to acephalous.

A bird of Celebes (megacephalon maleo), allied to the brush turkey. It makes mounds in which to lay its eggs.

Having the cranial cavity of medium capacity; neither megacephalic nor microcephalic.

Having a small head; having the cranial cavity small; -- opposed to Ant: megacephalic.

vertebrates, and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water. The pharynx is usually dilated in the form…