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Rh moderate or considerable length. Two centralia pedis are doubtfully known only in Labidosaurus. Dichocephalous ribs are known only in Seymouria and Pantylus. The cleithrum is vestigial in some.



. Primitive, terrestrial, insectivorous reptiles less than three feet in length. Teeth conical in a single row on jaws and dentaries. Cleithrum vestigial or absent. Vertebral spines vestigial, the vertebrae with broad arches.

Seymouria Broili (? Conodectes Cope). United States.

. Slender reptiles about one foot in length. Skull and intercentra unknown.

Eosauravus (Middle Pennsylvanian). United States.

Sauravus. Thevenin, France.

. Small reptiles six to eight or ten inches in length, insectivorous or invertebrate feeders. Teeth obtusely