Abstract

ANOTHER SKULL OF PROLACERTA

BY CHARLES L. CAMP

Prolacerta, described in 1935 by Parrington, is represented in the University of California collections by a complete skull, cervical vertebrae, and ribs, from the Lower Triassic of South Africa. Parrington’s view that this eosuchian approaches the ancestry of the lizards can be confirmed. The lower temporal bar consists of a slender process of the jugal which just fails to reach the quadrate. There is a remnant of a “quadratojugal.” The vertebrae are amphicoelous with cervical inter-centra. No osteoderms are preserved, and since there are no traces of them over the skull it does not seem that Broom’s explanation of the cause of disappearance of the posterior process of the jugal in lizards can be supported. Nevertheless Broom’s suggested derivation of lizards from Eosuchia is clearly indicated by this specimen.

SEQUENCE OF VERTEBRATE FAUNAS IN THE PRE-TERTIARY OF THE SOUTHWEST

BY CHARLES L. . . .

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