from The Century Dictionary and Cyclopedia

  • n. A genus of nautiloid cephalopods with shell loosely coiled in an asymmetrical depressed spiral. The coils are rounded or oval in section in adult and gerontic stages, and show traces of an impressed zone in nepionic and neanic stages. The surface is usually ornamented by oblique ribs or striations. The genus occurs in Silurian rocks.


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