Acrania

== Translingual == === Proper noun === Acrania (zoology, obsolete) A class of Vertebrata including Branchiostoma (syn. Amphioxus), in which no skull exists. ==== Synonyms ==== (zoology): Myelozoa, Leptocardia, Acephala === References === William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “Acrania”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.