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.
Fig. 162. Skeleton and life restoration of Cotylosaurs: A, Diasparactus. After Case. One twentieth natural size. B, Seymouria. About two feet long.
Family Seymouriidae. 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.
Family Sauravidae. Slender reptiles about one foot in length. Skull and intercentra unknown.
Eosauravus (Middle Pennsylvanian). United States.
Sauravus. Thevenin, France.
Family Gymnarthridae. Small reptiles six to eight or ten inches in length, insectivorous or invertebrate feeders. Teeth obtusely
