The Collaborative International Dictionary of English v.0.48:

Baculite \Bac"u*lite\, n. [L. baculum stick, staff; cf. F.
   baculite.] (Paleon.)
   A cephalopod of the extinct genus Baculites, found fossil
   in the Cretaceous rocks. It is like an uncoiled ammonite.
   [1913 Webster]