Animal Life: A First Book of ZoölogyD. Appleton, 1901 - Всего страниц: 329 |
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Стр. 37
... tentacles , continuations of the body wall and similarly composed . Such a body structure is the general or fundamental one for all polyps , corals , sea - anemones , and jelly - fishes . The variety in shape and the superficial ...
... tentacles , continuations of the body wall and similarly composed . Such a body structure is the general or fundamental one for all polyps , corals , sea - anemones , and jelly - fishes . The variety in shape and the superficial ...
Стр. 38
A First Book of Zoölogy David Starr Jordan, Vernon Lyman Kellogg. tentacles . The wall of the cylinder is composed of an outer and an inner layer of cells and a thin non - cellular membranous layer between them . The tentacles are hol ...
A First Book of Zoölogy David Starr Jordan, Vernon Lyman Kellogg. tentacles . The wall of the cylinder is composed of an outer and an inner layer of cells and a thin non - cellular membranous layer between them . The tentacles are hol ...
Стр. 39
... tentacles , are small oval sacs , in each of which lies folded or coiled a fine long thread . When the tentacles touch one of the small animals which serve Hydra as food , these fine threads shoot out from their sacs and so poison or ...
... tentacles , are small oval sacs , in each of which lies folded or coiled a fine long thread . When the tentacles touch one of the small animals which serve Hydra as food , these fine threads shoot out from their sacs and so poison or ...
Стр. 40
... tentacles move about in the water , and are continually contracting or extending . Like Volvox and the sponges , those other slightly com- plex animals we have already considered , Hydra has two methods of multiplication . In the ...
... tentacles move about in the water , and are continually contracting or extending . Like Volvox and the sponges , those other slightly com- plex animals we have already considered , Hydra has two methods of multiplication . In the ...
Стр. 42
... tentacles at its free end . This polyp gives rise by budding to new polyps , which remain attached to it , and gradually a new tree - like colony is formed . From this polyp or this colony new medusæ bud off , swim away , and finally ...
... tentacles at its free end . This polyp gives rise by budding to new polyps , which remain attached to it , and gradually a new tree - like colony is formed . From this polyp or this colony new medusæ bud off , swim away , and finally ...
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adaptation adult alimentary canal Amaba ants become bees birds butterfly called cavity CLASS colony color complex animals composed conjugation crab crustaceans cytoplasm degeneration differentiation digestion divide ectoderm egg cells existence eyes fauna feed female fish flagella free-swimming function gastrula Globigerinæ habits hatched higher animals host Hydra inclosed increase individuals insects instinct intestine islands jelly-fishes kinds of animals larva larvæ layer live male mals mammals many-celled animals mass medusa mouth opening naturalists nerve nest nucleus ocean oesophagus one-celled organs outer oxygen Pandorina papillæ Paramecium parasites parent perform plants polyp prey primitive processes produced protective resemblance protoplasm Protozoa pseudopods queen Radiolaria reflex action reproductive cells Sacculina sea-anemone shape shell simple simplest animals single cell special sense species sperm cells spherical spiders sponge stage structure substance surface swim tentacles tion tissues vertebrates Volvox Vorticella wings workers worms young