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antero-superognathal apparently base beak belong blade bone Buffalo Bull clearly Cleveland Collected by W. L. compared complete Conodont bed cutting dental plate denticles described Devonic Dinichthys dorsal Eastman edge Eighteen Mile Creek element entire Erie County extremity fact figure fins fish Formation fossil fragmentary fragments front functional Genesee genus half head height imperfect impression inner view known lacking lateral length limestone lines locality lower dental plate mandible margin matrix Measurements median middle N. Y. Collected natural Newberry North Evans Ohio Original ornamentation outer view outline pectoral Portage portion posterior preceding present preserved probably referred region remains represented restored ridge scales seems shale shark showing shown side smooth species specimen spine Stenognathus surface symphyseal teeth text-fig tooth tritor tubercles upper ventral W. L. Bryant width York