. Transactions of the American Philosophical Society. Testudinata. Anomodonta. Rhvnchocephalia. ITheriodonta. five reptilian series might be then further defined as follows: Quadrate fixed ; no supramastoid or supratemporal foramen or separate arch Tlicromora. Quadrate fixed ; a supramastoid foramen and arch IchtJiyopterygia. Quadrate fixed ; a supratemporal and zygomatic arch Archosauria. Quadrate fixed ; a zj-gomatic arch only Synaptosaurza. Quadrate free ; no supramastoid foramen or arch ; a supratemporal but no zygomatic arch. Streptostylica. IN THE KEPTILIA. 25. The Thero
. Transactions of the American Philosophical Society. Testudinata. Anomodonta. Rhvnchocephalia. ITheriodonta. five reptilian series might be then further defined as follows: Quadrate fixed ; no supramastoid or supratemporal foramen or separate arch Tlicromora. Quadrate fixed ; a supramastoid foramen and arch IchtJiyopterygia. Quadrate fixed ; a supratemporal and zygomatic arch Archosauria. Quadrate fixed ; a zj-gomatic arch only Synaptosaurza. Quadrate free ; no supramastoid foramen or arch ; a supratemporal but no zygomatic arch. Streptostylica. IN THE KEPTILIA. 25. The Theromora are the earliest in time, and their order of Theriodonta presentsthe nearest affinities to the Mammalia. The Cotylosauria, on the other hand, dis-play the nearest relations to the Stegocephalous Batrachia. In the following illustrations the phylogenetic successions are indicated by dia-grams based on the skull of Pantylus cordatus. This is adopted as the most conve-nient of the Cotylosaurian types to be taken as a standard, because it displays
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