Coal; its history and uses . Fig. 17. Upper and under surfaces of skull of Archegosaurus. of the pulp-cavity. In some of the Carboniferous Laby-rinthodonts there are no secondary folds of dentine, andthe degree of convolution varies from a simple undulationto a complex and far from regular labyrinth. As a rulethe complexity increases with the size of the species. Theteeth are lodged in shallow depressions, which take theform of the base, and are often marked by radiating ridgescorresponding with the folds of dentine. The existence of Labyrinthodonts in the Coal Measures CHAP. IV. ANIMALS OF TH
Coal; its history and uses . Fig. 17. Upper and under surfaces of skull of Archegosaurus. of the pulp-cavity. In some of the Carboniferous Laby-rinthodonts there are no secondary folds of dentine, andthe degree of convolution varies from a simple undulationto a complex and far from regular labyrinth. As a rulethe complexity increases with the size of the species. Theteeth are lodged in shallow depressions, which take theform of the base, and are often marked by radiating ridgescorresponding with the folds of dentine. The existence of Labyrinthodonts in the Coal Measures CHAP. IV. ANIMALS OF THE COAL MEASURES. 119 was first rendered probable by the discovery, in 1842, of afossil Amphibian at Miinster-appel in Ehenish new form was described by Von Meyer in the followingyear, under the name of Apateon pedestris. It is a smalland in many respects obscure specimen, but there is nowno doubt at any rate as to its Amphibian character. Thebones of the limbs, though imperfect, are sufficient todistinguish it f
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlo, booksubjectcoal
