The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2AMS Press, 1972 |
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Página 245
... stage . Sometimes it is only the earlier developmental stages which fail . Thus Fritz Müller has made the remarkable discovery that certain shrimp - like crustaceans ( allied to Penous ) first appear under the simple nauplius - form ...
... stage . Sometimes it is only the earlier developmental stages which fail . Thus Fritz Müller has made the remarkable discovery that certain shrimp - like crustaceans ( allied to Penous ) first appear under the simple nauplius - form ...
Página 251
... stages of its development ; so that the larva , in the first stage , might come to differ greatly from the larva in the second stage , as is the case with many animals . The adult might also become fitted for sites or habits , in which ...
... stages of its development ; so that the larva , in the first stage , might come to differ greatly from the larva in the second stage , as is the case with many animals . The adult might also become fitted for sites or habits , in which ...
Página 316
... STAGE . - A stage in the development of certain Crustaceans ( Prawns ) , in which they closely resemble the adults of a genus ( Mysis ) belonging to a slightly lower group . NASCENT . - Commencing development . NATATORY . - Adap'ed for ...
... STAGE . - A stage in the development of certain Crustaceans ( Prawns ) , in which they closely resemble the adults of a genus ( Mysis ) belonging to a slightly lower group . NASCENT . - Commencing development . NATATORY . - Adap'ed for ...
Contenido
CONTENTS OF VOL | 1 |
CHAPTER X | 48 |
CHAPTER XII | 129 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit adult affinity allied species ancient animals appear Archipelago arctic areas become beds believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo Europe existing extinct fact faunas fertilised 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 individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian slight South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings