The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 377
... crustaceans , any such defini- tion has hitherto been found impossible . There are crustaceans at the opposite ends of the series , which have hardly a character in common ; yet the species at both ends , from being plainly allied to ...
... crustaceans , any such defini- tion has hitherto been found impossible . There are crustaceans at the opposite ends of the series , which have hardly a character in common ; yet the species at both ends , from being plainly allied to ...
Стр. 392
... crustaceans , the general pattern seems thus to have become partially obscured . There is another and equally curious branch of our subject ; namely , serial homologies , or the comparison of the different parts or organs in the same ...
... crustaceans , the general pattern seems thus to have become partially obscured . There is another and equally curious branch of our subject ; namely , serial homologies , or the comparison of the different parts or organs in the same ...
Стр. 399
... crustaceans ( allied to Penous ) first appear under the simple nauplius - form , and after passing through two or more zoea - stages , and then through the mysis - stage , finally acquire their mature structure : now in the whole great ...
... crustaceans ( allied to Penous ) first appear under the simple nauplius - form , and after passing through two or more zoea - stages , and then through the mysis - stage , finally acquire their mature structure : now in the whole great ...
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adapted admit affinity ancient animals appear Archipelago areas become believe belonging birds Cambrian characters classification climate closely allied species common continent creation crustaceans degree deposits descent with modification developed difficulty distant distinct species domestic doubt embryo Europe existing extinct facts faunas fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important INDIANENSIS individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials MDCCCXX migration modified descendants mongrels mountains natural selection naturalists nearly oceanic islands offspring parent peculiar perfect pistil plants pollen present probably produced progenitor quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds SIGILLUM Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory of natural tion variations varieties VERITAS whole widely different