. Guide leaflet. jnnerside. art Fig. 25. PROGRESSIVE INCREASE OF THE DENTARY Un) and reduction ofthe elements behind the dentary, leading to the mammalian jaw, which has formed anew articulation with the skull (see Fig. 26). Inner side of left half of Primitive theromorph reptile, Dimetrodon. After Williston. B. Primitive gorgonop-sian, Cynarioides. After Broom. C. Progressive cynodont,. Cynognathiis. Partly afterWatson. D. Ictidosaurian. After Broom C49: INTRODUCTION TO HUMAN ANATOMY

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