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Form and Function: A Contribution to the History of Animal Morphology
E. S. Russell
Limited preview - 2019
according activity adaptation adult alimentary canal anatomy ancestral animals appear archenteron arches archetype arrangement Baer become birds body bones called causes cells characters classes clearly close common comparative complete conception connections considered course Cuvier Darwin definite determined differentiation direct distinct distinguished early elements embryo embryology essentially evolution existence fact fish formation function further Geoffroy gives groups higher homology idea important independent individual influence interest later layer less living lower mammals material means modifications morphology Nature nervous notochord observed organisation organs origin parallelism particular period plants plates position possible present primitive principle problem pure recognised regarded relation resemblance result seems segmentation sense separate similar single skeleton skull species stages structure theory things thought tion tissues true unity Vertebrates whole writes