The Collaborative International Dictionary of English v.0.48:

Octocerata \Oc`to*cer"a*ta\, n. pl. [NL., fr. Gr. 'oktw` eight +
   ?, a horn.] (Zool.)
   A suborder of Cephalopoda including Octopus, Argonauta,
   and allied genera, having eight arms around the head; --
   called also Octopoda.
   [1913 Webster]