A manual of zoologyWilliam Blackwood & Sons, 1878 |
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Página 15
... aperture for its admission , and no in- ternal cavity for its reception . The food of almost all animals consists of solid particles , and they are therefore usually provided with a mouth and a distinct digestive cavity . Some animals ...
... aperture for its admission , and no in- ternal cavity for its reception . The food of almost all animals consists of solid particles , and they are therefore usually provided with a mouth and a distinct digestive cavity . Some animals ...
Página 18
... aperture for the excre- tion of effete and indigestible matters . Digestion is performed by a distinct stomach with accessory glands ; a special contrac- tile cavity , or heart , is provided for the propulsion of the nutri- tive ...
... aperture for the excre- tion of effete and indigestible matters . Digestion is performed by a distinct stomach with accessory glands ; a special contrac- tile cavity , or heart , is provided for the propulsion of the nutri- tive ...
Página 55
... aperture is present in the higher Protozoa , but in many there is none ; and in all , the digestive apparatus is of the simplest character . Organs of generation , or at any rate differentiated portions of the body which act as these ...
... aperture is present in the higher Protozoa , but in many there is none ; and in all , the digestive apparatus is of the simplest character . Organs of generation , or at any rate differentiated portions of the body which act as these ...
Página 61
... aperture , so far as has ever been certainly observed , and the food is merely taken into the interior of the body by a process of intussusception - any portion of the surface being chosen for this purpose , and acting as an ...
... aperture , so far as has ever been certainly observed , and the food is merely taken into the interior of the body by a process of intussusception - any portion of the surface being chosen for this purpose , and acting as an ...
Página 63
... aperture at one extremity , through which the pseudopodia are protruded ( fig . 8 ) . The animal generally creeps about head - downwards , so to speak ; that is to say , with the closed end of the cara- pace elevated above the surface ...
... aperture at one extremity , through which the pseudopodia are protruded ( fig . 8 ) . The animal generally creeps about head - downwards , so to speak ; that is to say , with the closed end of the cara- pace elevated above the surface ...
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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