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

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