. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 316 COMPARATIVE ANATOMY Spelerpes, Plethodon, Batrachoseps, Fig. 230); in the larvae of Sala- manders and in Proteus the splenial of the lower jaw is also toothed. Horny teeth and horny jaws are present in larval Anura (except Xenopus), and similar structures occur in Siren lacertina. Teeth are altogether absent in the Bufonidae and in Pipa. The teeth of certain of the Stegocephali (Labyrinthodonta) were extremely complicated, the enamel forming numerous corrugated folds extending from the periphery towards the centre. Re
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 316 COMPARATIVE ANATOMY Spelerpes, Plethodon, Batrachoseps, Fig. 230); in the larvae of Sala- manders and in Proteus the splenial of the lower jaw is also toothed. Horny teeth and horny jaws are present in larval Anura (except Xenopus), and similar structures occur in Siren lacertina. Teeth are altogether absent in the Bufonidae and in Pipa. The teeth of certain of the Stegocephali (Labyrinthodonta) were extremely complicated, the enamel forming numerous corrugated folds extending from the periphery towards the centre. Reptiles and Birds.—Corresponding with the greater firm- ness of the skull in Reptiles, the teeth are usually strongly ZK. RF. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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