An Essay on Classification |
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3e sér Acalephs Acephala affinities AGASSIZ analogy Anatomie animal kingdom animals and plants Annelides appear Archiv Articulata ascertain Beiträge Berlin Birds Brachiopoda branches Bryozoa Cephalopoda Cetacea character characteristic characterized Cirripedia classification combinations complication connection considered constitute Crinoids Crustacea Cuvier Decapods distinct diversified divisions Echinoderms eggs Embryology embryonic ence Entomostraca Entwickelung Evolutio exhibits thought existence facts families Fishes fossiles genera genus geological geological periods globe gradation growth Hist homologies Hydroids identical individuals Infusoria Insects investigations Journ larvæ Leipzig Leuckart limits Linnæus living London Mammalia Mollusca Mollusks Müller's Arch Myriapoda natural groups naturalists orders parasites Paris past ages peculiarities period physical agents plan of structure Polyps present Radiata reference relations representatives Reptiles respecting Rotifera Sect species successive systems of organs Thiere tion true Tunicata types Ueber Vertebrata whole wiss Worms Zeitsch Zool zoologists Zoology