The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 55
... Crustaceans : thus , the male of a Tanais regularly occurs under two distinct forms ; one of these has strong and differently shaped pincers , and the other has antennæ much more abundantly fur- nished with smelling - hairs . Although ...
... Crustaceans : thus , the male of a Tanais regularly occurs under two distinct forms ; one of these has strong and differently shaped pincers , and the other has antennæ much more abundantly fur- nished with smelling - hairs . Although ...
Page 151
... crustaceans , in which sev- eral parts of the structure become less perfect , so that the mature animal cannot be called higher than its larva . Von Baer's standard seems the most widely ap- plicable and the best , namely , the amount ...
... crustaceans , in which sev- eral parts of the structure become less perfect , so that the mature animal cannot be called higher than its larva . Von Baer's standard seems the most widely ap- plicable and the best , namely , the amount ...
Page 193
... crustaceans offer excellent illustra- tions of this law . " In Pontella , for instance , the sexual characters are afforded mainly by the anterior antennæ and by the fifth pair of legs : the specific differences also are principally ...
... crustaceans offer excellent illustra- tions of this law . " In Pontella , for instance , the sexual characters are afforded mainly by the anterior antennæ and by the fifth pair of legs : the specific differences also are principally ...
Page 218
... Crustacea and Mollusca are adapted to live on the land ; and seeing that we have flying birds . and mammals , flying insects of the most diversified types , and formerly had flying reptiles , it is conceivable that flying - fish , which ...
... Crustacea and Mollusca are adapted to live on the land ; and seeing that we have flying birds . and mammals , flying insects of the most diversified types , and formerly had flying reptiles , it is conceivable that flying - fish , which ...
Page 233
... crustaceans not only many trivial , but some important parts assume a new character , as recorded by Fritz Mül- ler , after maturity . In all such cases , and many could be given , -if the age for reproduction were retarded , the ...
... crustaceans not only many trivial , but some important parts assume a new character , as recorded by Fritz Mül- ler , after maturity . In all such cases , and many could be given , -if the age for reproduction were retarded , the ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young