The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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... ASCIDIAN . 23. LARVA OF ASCIDIAN 25. IMPRESSION OF TAIL OF ARCHEOPTERYX 253 · 255 266 26. SKELETONS OF FEET : ANCHITHERIUM , HIPPARION , Horse 274 THE DOCTRINE OF DESCENT AND DARWINISM . I. Introduction -
... ASCIDIAN . 23. LARVA OF ASCIDIAN 25. IMPRESSION OF TAIL OF ARCHEOPTERYX 253 · 255 266 26. SKELETONS OF FEET : ANCHITHERIUM , HIPPARION , Horse 274 THE DOCTRINE OF DESCENT AND DARWINISM . I. Introduction -
Página 36
... Ascidians , a class of animals which in their mature condition do not bear the remotest re- semblance to the Vertebrata . When we become aware of these deviations from so - called laws of form and structure , seemingly well established ...
... Ascidians , a class of animals which in their mature condition do not bear the remotest re- semblance to the Vertebrata . When we become aware of these deviations from so - called laws of form and structure , seemingly well established ...
Página 52
... Ascidians , and the Lancelet . From the analogy of all these animals , and especially of the last , we shall be able hereafter to derive important inductions . But if no weight be attached to the presence of . these filaments of the ...
... Ascidians , and the Lancelet . From the analogy of all these animals , and especially of the last , we shall be able hereafter to derive important inductions . But if no weight be attached to the presence of . these filaments of the ...
Página 252
... Ascidians temporarily possess a spinal cord , and the rudiments of a vertebral column . Kowalewsky's researches have ... Ascidian larva consists of a body of which our figure shows the whole , and a rudder - like tail . The appendages ...
... Ascidians temporarily possess a spinal cord , and the rudiments of a vertebral column . Kowalewsky's researches have ... Ascidian larva consists of a body of which our figure shows the whole , and a rudder - like tail . The appendages ...
Página 255
... Ascidian larva that vertebrate animals are descended from the Ascidians . Their accordance much rather forces us to assume an unknown primordial vertebrate family , springing from some branch of the heterogeneous division of the ...
... Ascidian larva that vertebrate animals are descended from the Ascidians . Their accordance much rather forces us to assume an unknown primordial vertebrate family , springing from some branch of the heterogeneous division of the ...
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Términos y frases comunes
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian birds body bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryo Eocene exhibit existence external facts families fauna fish formation fossil Gastrula gemmules genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer intermediate forms investigation islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observations Oolite organisms origin ovum peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races regard relations remains reproduction reptiles Rütimeyer says scarcely scientific separate sexual Silurian skull species strata structure systematic terrestrial animals theory of selection tion transformation true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole