To the Ratitae belong possibly also the imperfectly known _Diatryma_,
Eocene of New Mexico, _Gastornis_ and _Dasornis_, Eocene of Europe,
_Genyornis_, Pleistocene of Australia.
II. Division ODONTOLCAE.--Marine, flightless, without sternal keel.
Upper and lower jaws with teeth in furrows. Cretaceous epoch.
_Enaliornis_, England, vertebrae chiefly biconcave; _Hesperornis_, North
America, vertebrae heterocoelous.