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Simultaneous Existence of the Most Diversified Types
Unity of Plan in Otherwise High Diversified Types
Simultaneous Existence in the Earliest Geological
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Acalephs Acephala affinities Agassiz Amphipoda analogies anatomy animal kingdom animals and plants Annelides Anthozoa appear aquatic Articulata ascertained Baer Birds Brachiopods branches Bryozoa Carnivora Cephalopoda Cetacea changes character characteristic characterized classification combinations compared complication connection considered constitute Crinoids Crustacea Ctenophorae Cuvier Decapods different plans distinct diversified divisions Echinoderms eggs Embryology embryonic Entomostraca Essay Evolutio exhibits thought existence extensive fact families fauna Fishes fossil Gasteropoda genera genus geographical distribution geological geological periods globe gradation growth higher homologies Hydroids identical individuals influence Infusoria Insects instance intestine investigations kind known living Mammalia mode Mollusca Mollusks Myriapoda natural groups Natural History naturalists Oken orders origin past ages peculiar period physical agents plan of structure Polyps present Radiata reference relations representatives Reptiles resemblance respecting Rotifera species subdivisions successive systems of organs tion toes true types Vertebrata Vertebrates vols whole Worms zoologists Zoology