Palaeontology Or a Systematic Summary of Extinct Animals and Their Geological Relations

affinities alveolar Amphitherium animal arch Archegosaurus articular batrachian beds birds bones bony canine carboniferous cavity centrum chalk characters concave condyle cones convex coracoid crocodiles crocodilian crown cusps Cuvier dental dentition deposits developed discovered dorsal enamel eocene evidence existing external extinct feet femur fishes footprints foramen fore formation fossil ganoid genera genus geological groove hind humerus Ichthyosaurus impressions inches incisors indicate inner Labyrinthodon Labyrinthodonts lacertian length lias limbs lizards lobe Lophiodon lower jaw mammalian Mammals marsupial Mastodon maxillary median middle miocene modifications neural nostrils Nothosaurus oolitic orbits ossification outer pair peculiar period phalanges Pistosaurus Placodus Plagiaulax plates Plesiosaurus pliocene Pliolophus Pliosaurus posterior premaxillary premolar present proportions quadrupeds red sandstone remains reptiles resembles ribs ridges saurian shell side Silurian skeleton skull slender species specimen spines strata structure surface tail teeth tertiary thecodont tooth transverse true molars tusks upper jaw vertebræ