A manual of zoologyWilliam Blackwood & Sons, 1878 |
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Página 26
... females of certain butterflies normally appear under two or three entirely different forms , not connected by any inter- mediate links ; and the same thing occurs in some of the Crustacea . As an example of this it is sufficient to ...
... females of certain butterflies normally appear under two or three entirely different forms , not connected by any inter- mediate links ; and the same thing occurs in some of the Crustacea . As an example of this it is sufficient to ...
Página 36
... females ; but it seems best to consider these phenomena sepa- rately . Strictly the term parthenogenesis ought to be confined to the production of new individuals from virgin females by means of oya , which are enabled to develop ...
... females ; but it seems best to consider these phenomena sepa- rately . Strictly the term parthenogenesis ought to be confined to the production of new individuals from virgin females by means of oya , which are enabled to develop ...
Página 37
... females , all the young are of one kind , variously regarded as neuters , virgin females , or hermaphrodites . Whatever their true nature may be , these individuals produce , viviparously , a brood of young which resemble themselves ...
... females , all the young are of one kind , variously regarded as neuters , virgin females , or hermaphrodites . Whatever their true nature may be , these individuals produce , viviparously , a brood of young which resemble themselves ...
Página 38
... females ) and queens ( fertile females ) are fertilised on their passage through the oviduct , the semen being allowed to escape into the oviduct for this purpose . The subsequent development of these fecundated ova into workers or ...
... females ) and queens ( fertile females ) are fertilised on their passage through the oviduct , the semen being allowed to escape into the oviduct for this purpose . The subsequent development of these fecundated ova into workers or ...
Página 39
... female which is produced partheno- genetically ; whereas in the honey - bee and in Polistes it is the male . There ... females , and scanty diet giving rise to males . served in the process as it occurs in different animals DEVELOPMENT ...
... female which is produced partheno- genetically ; whereas in the honey - bee and in Polistes it is the male . There ... females , and scanty diet giving rise to males . served in the process as it occurs in different animals DEVELOPMENT ...
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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