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

affinities animal arch Archegosaurus articular batrachian beds birds bones bony canine carboniferous cavity Cetacea chalk characters clay condyle cones convex cretaceous crocodiles crocodilian crown Cuvier dental dentition deposits developed Devonian discovered dorsal eocene evidence existing external feet fishes fore formations fossil ganoid genera genus geological greensand hind Ichthyosaurus Iguanodon impressions inches incisors indicate inner Labyrinthodonts lacertian length lias limbs limestone lizards lobe London clay lower jaw mammalian Mammals marginal marsupial maxillary miocene modifications molar nostrils Nothosaurus notochord old red oolitic orbits organic ossification outer pair paleozoic peculiar period Pistosaurus Placodus plates Plesiosaurus pliocene posterior premaxillary premolar present proportions quadrupeds red sandstone represented reptiles resembles ribs ridges rocks saurian shell shew shewn side Silurian siphuncle skeleton skull slender specimen spines strata structure surface sutures tail teeth tertiary thecodont tion tooth transverse trias triassic tusks upper jaw valve vertebræ Wealden