The chief character which distinguishes the Batrachians from the reptiles, leaving aside the metamorphoses, lies in the arrangement of the bones of the palate, where a large parasphenoid extends forwards as far or nearly as far as the vomers and widely separates the pterygoids.
Simultaneously on the vomers, the palatines, Rsvc, Lsvc, right the pterygoids and the parasphenoid in and left supesome of the Stegocephalia (Dawsonia, Seeleya, rior cavae.
Dontinae and Desmognathinae), on the vomers, Ao, Left aortic Pterygoids and parasphenoid (some Pelobates), arch.
On the vomers and parasphenoid (Triprion, P.A.
Later on fused with, a pair of membrane bones, the basi-temporals, homologous in part with the parasphenoid of lower vertebrates.