from The Century Dictionary and Cyclopedia

  • In Hyatt's classification, a family of magnosellarian eurycampylous ammonoid cephalopods having involute shells with ribs on the venter, broad hyponomic sinus, and with the broad inner lateral saddles of the suture-line divided by short lobes into two subequal saddles. The two principal genera are Dimeroceras of the Upper Devonian and Pericyclus of the Carboniferous limestone.


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