A manual of zoologyWilliam Blackwood & Sons, 1878 |
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Página 12
... regarded by sea- side visitors as a sea - weed . Many of the Protozoa are equally like some of the lower plants ( Protophyta ) ; and even at the present day there are not wanting those who look upon the sponges as belonging to the ...
... regarded by sea- side visitors as a sea - weed . Many of the Protozoa are equally like some of the lower plants ( Protophyta ) ; and even at the present day there are not wanting those who look upon the sponges as belonging to the ...
Página 16
... regarded from two totally distinct , and , indeed , often apparently opposite , points of view . From the first point of view we have to look simply to the laws , form , and arrangement of the structures of the organism ; in short , to ...
... regarded from two totally distinct , and , indeed , often apparently opposite , points of view . From the first point of view we have to look simply to the laws , form , and arrangement of the structures of the organism ; in short , to ...
Página 24
... regarded . merely as a convenient , but not immutable , abstraction , the employment of which is necessitated by the requirements of classification . By Buffon , " species " is defined as " a constant succession of individuals * similar ...
... regarded . merely as a convenient , but not immutable , abstraction , the employment of which is necessitated by the requirements of classification . By Buffon , " species " is defined as " a constant succession of individuals * similar ...
Página 25
... regarded as being descended , from a single primitive pair by an uninterrupted succession of families . " Müller defines species as " a living form , represented by individual beings , which reappears in the product of generation with ...
... regarded as being descended , from a single primitive pair by an uninterrupted succession of families . " Müller defines species as " a living form , represented by individual beings , which reappears in the product of generation with ...
Página 31
... regarded as independent beings . They are generally , in all respects , identical with the primor- dial segment , and it is rather a case of " vegetative " repeti- tion of similar parts . Another form of gemmation is exhibited in such ...
... regarded as independent beings . They are generally , in all respects , identical with the primor- dial segment , and it is rather a case of " vegetative " repeti- tion of similar parts . Another form of gemmation is exhibited in such ...
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Outras edições - Ver tudo
Manual of Zoology ...: With a General Introduction on the Principles of Zoology Henry Alleyne Nicholson Pré-visualização indisponível - 2015 |
Palavras e frases frequentes
abdomen adult alimentary canal ambulacral amongst animal Annelides antennæ anus aperture appendages Arachnida articulated attached birds bivalve body bones Brachiopoda branchiæ branchial calcareous carapace cavity cephalothorax chitinous ciliated composed comprising consists contractile Crustacea Ctenophora developed disc distinct division dorsal embryo Eocene external extinct extremity feet females fins fishes Foraminifera fossil furnished gemmation genera genus gills head horny Huxley Hydrozoa incisors Insects integument intestine known labium larva larvæ legs limbs living locomotive males Mammals mandibles margin maxillæ membrane molars Mollusca mouth nervous system operculum organs ovum Owen pairs Paleozoic parasitic placed plates polypide polypites Polyzoa portion possess posterior present regarded reproductive Reptiles resembling respiratory Rotifera rudimentary Scolecida segments shell side Silurian single skeleton sometimes somites species spines stomach structure sub-order surface tail teeth tentacles termed thorax toes transverse tube upper usually valves ventral Vertebrates vesicle whilst wings Zoantharia zooids