orbitolites

from The Collaborative International Dictionary of English v.0.48

Orbitolites \Or`bi*to*li"tes\, prop. n. [NL. See {Orbit}, and
   {-lite}.] (Zool.)
   A genus of living {Foraminifera}, forming broad, thin,
   circular disks, containing numerous small chambers.
   [1913 Webster]