inoceramus

from The Collaborative International Dictionary of English v.0.48

Inoceramus \In`o*cer"a*mus\, n. [NL., fr. Gr. 'i`s, 'ino`s, a
   muscle + ? an earthen vessel.] (Paleon.)
   An extinct genus of large, fossil, bivalve shells, allied to
   the mussels. The genus is characteristic of the Cretaceous
   period.
   [1913 Webster]