Animal Life: A First Book of ZoölogyD. Appleton, 1901 - Всего страниц: 329 |
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Стр. vii
... Vorticella , 12. - Marine Protozoa , 15. - Globigerinæ and Radio- laria , 16. - Antiquity of the Protozoa , 20. - The primitive form , 20. The primitive but successful life , 21 . II . THE LIFE OF THE SLIGHTLY COMPLEX ANIMALS Colonial ...
... Vorticella , 12. - Marine Protozoa , 15. - Globigerinæ and Radio- laria , 16. - Antiquity of the Protozoa , 20. - The primitive form , 20. The primitive but successful life , 21 . II . THE LIFE OF THE SLIGHTLY COMPLEX ANIMALS Colonial ...
Стр. 12
... Vorticella . - Another interesting and readily found protozoan is Vorticella ( Fig . 8 ) . While the Amoeba can crawl and Paramecium swim , Vorticella , except when very young , A B C FIG . 8. - Vorticella microstoma ( after STEIN ) . A ...
... Vorticella . - Another interesting and readily found protozoan is Vorticella ( Fig . 8 ) . While the Amoeba can crawl and Paramecium swim , Vorticella , except when very young , A B C FIG . 8. - Vorticella microstoma ( after STEIN ) . A ...
Стр. 13
... Vorticella are found together on a common stalk , thus forming a proto- zoan colony . The life processes of Vorticella are of the simple kind already observed in Amaba and Paramecium . Vorticella shows , however , some modifications of ...
... Vorticella are found together on a common stalk , thus forming a proto- zoan colony . The life processes of Vorticella are of the simple kind already observed in Amaba and Paramecium . Vorticella shows , however , some modifications of ...
Стр. 14
... Vorticella . It does need to cling to the inner wall of the alimentary canal of its host , and the body of some species is provided with hooks for that purpose . The * Specimens of Gregarina can be abundantly found in the alimen- tary ...
... Vorticella . It does need to cling to the inner wall of the alimentary canal of its host , and the body of some species is provided with hooks for that purpose . The * Specimens of Gregarina can be abundantly found in the alimen- tary ...
Стр. 15
... Vorticella . When the Gregarina is ready to multiply , its body , which in most species is rather elongate and flattened , contracts into a ball - shaped mass and becomes encysted — that is , becomes inclosed in a tough , membranous ...
... Vorticella . When the Gregarina is ready to multiply , its body , which in most species is rather elongate and flattened , contracts into a ball - shaped mass and becomes encysted — that is , becomes inclosed in a tough , membranous ...
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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