Animal Parasites and MessmatesD. Appleton and Company, 1876 - 274 pagini |
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Pagina 191
... cercariæ in different degrees of develop- ment . In front , we see one pro- vided with eyes and a tail ; behind , we see others which are younger ; among these ciliated embryos , wandering without guidance and without a compass in the ...
... cercariæ in different degrees of develop- ment . In front , we see one pro- vided with eyes and a tail ; behind , we see others which are younger ; among these ciliated embryos , wandering without guidance and without a compass in the ...
Pagina 192
... Cercariæ , which was given to them at a time when their genealogy was unknown . They are not very unlike the tadpoles of the frog ( Fig . 45 ) . The mother was only a bag with ciliæ , and sometimes with eyes . The tadpole has a distinct ...
... Cercariæ , which was given to them at a time when their genealogy was unknown . They are not very unlike the tadpoles of the frog ( Fig . 45 ) . The mother was only a bag with ciliæ , and sometimes with eyes . The tadpole has a distinct ...
Pagina 194
... cercariæ are very tenacious of life ; we have kept some alive in fresh water during a whole week in the month of November , and on the last day they were still active ( Cercaria armata ) . We sometimes find the cercarian age passed over ...
... cercariæ are very tenacious of life ; we have kept some alive in fresh water during a whole week in the month of November , and on the last day they were still active ( Cercaria armata ) . We sometimes find the cercarian age passed over ...
Pagina 198
... cercariæ has only to examine some fresh - water molluscs , either the Limnes or Planorbes found in ponds ; as he tears the animal to pieces on the stage of a simple microscope , he will not fail to perceive a multitude of struggling and ...
... cercariæ has only to examine some fresh - water molluscs , either the Limnes or Planorbes found in ponds ; as he tears the animal to pieces on the stage of a simple microscope , he will not fail to perceive a multitude of struggling and ...
Pagina 202
... cercariæ , greatly magnified . the water . If we compress it slightly , we see that in the interior of the ciliated covering , there is still another animal , without eyes , without ciliæ , and of an entirely different form , which in ...
... cercariæ , greatly magnified . the water . If we compress it slightly , we see that in the interior of the ciliated covering , there is still another animal , without eyes , without ciliæ , and of an entirely different form , which in ...
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Termeni și expresii frecvente
abdomen abode acaridæ acarus amphipod animal annelids appearance Ascaris attacks become birds blood body Bothriocephalus Caligi carapace cavity cercaria cercariæ cestode cetacea ciliated cirrhipedes coast colour completely crab creatures crustaceans curious cysticerci cysticercus damp earth decapod distome echinoderm eggs embryos enclosed encysted female fish fleas gasteropod genus gives lodging harbours hatched hermaphrodite hooks host hymenoptera ichneumons infested inhabit insects intestines introduced isopod kind known larva larvæ leeches Leuckart live male manner messmates microscopic midst molluscs Mons mother mouth Müller natural naturalists neighbour nematode nourishment observed organs pagurus pass peculiar peritoneum pinnotheres plants polyps present prey produce Prof Professor Semper progeny remarkable resemble scolex seek sexes sexual sheep shell shelter side skin sometimes species sponge stomach Strongylus sucker tænia tæniæ Tania tape-worm trematode trichinæ usually whale worms young
Pasaje populare
Pagina iv - II. Physics and Politics ; or, Thoughts on the Application of the Principles of "Natural Selection " and " Inheritance