Outlines of Vertebrate Palæontology for Students of Zoology

animal appear arch armour arrangement articulation aspect base bear become bones cartilages caudal centra closely comparatively complete comprises covered Cretaceous dentition dermal differ digits distal dorsal earliest elements elongated Eocene Europe exhibit existing extended external extinct fins fishes foramen Formation fossils four France front fused genera genus head hinder hitherto Jurassic Kimmeridgian known lateral least length less Lias limbs Lower mandible mandibular margin maxilla median middle Miocene molars named nearly neural North America observed occur opening orbit ossified pair pectoral pelvic period Permian plates Pleistocene Pliocene portion posterior premolars present probably rays region relatively remains remarkable represented resembling restoration ribs scales seems separate shield short side similar single size.-L skeleton skull slender sometimes South specialized species specimens spines Sub-Order supports symphysis teeth transverse typical typical species Upper usually vacuity vertebræ