Zool. [f. ACTINO- + στόμα mouth.] L. Agassiz’s name for the mouth of radiated animals, considered by him as essentially different from that of Vertebrates.
1857. L. Agassiz, Contrib. Nat. Hist. N. Amer., IV. 376.
1880. Bell, in Zool. Jrnl. Lin. Soc., XV. No. 82, 127. The actinostome has been pushed forwards and to the left.
