AND AVFS OF NORTH AMEItle.k. PROTEIDA, Caudal vertebrte and frontal bones distinct. Inferior pelvic e1ententi4 not confluent. 0. o. prefrontalia and nasally wanting; palatina and pterygoidea esent. Ethmoid a vertical plate on each side the cerebral lobes. Mandible toothed, teeth pleurodont. Ceratohyals, first pair connate. No "postorbital and supertemporal bones." URODELA. 5 Usual cranial bones present, but pterygoids reduced or wanting. o "postorbital or supettemporal bones." Caudal vertebrae and frontal bones distinct. Ethmoid, a vertical plate on each side. Mandible dentigerous; teeth pleurodont. Inferior pelvic elements horizontal, in contact; no osseous pubis; ilium suspended to a sacral rib. (Mostl) no qualratojugal.) GYMNOPIIIDIA. Usual cranial bones present and distinct, including frontals and pterygoids. Caudal vertebra distinct. %'postorbital or supertemporal bones."t Ethmoid annulus surrounding cerebral lobes. Mandible dentigerous; teeth anchylosed by their bases.3.4 (A. quadratojugal.)
- Erroneously called orbitosphenoids by me. Journal Acad. 1806, (on Anura.) t When the temporal fossa is overarched, it is by expansion of the maxillary and quadratojugal. kStannius says. "Squama temporalis.") $ The teeth of Ci-ecilia are compressed with a trenchant posterior edge, which is crenate after the manner Qf Megalosanrus, Carcharias, etc. Thus to the numerous genera of Saurians and Selachians possessing this character. must be added a Batrachian.
AMERI. pintos°. soc.--VOL. XI V. 2
