A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
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Página 29
... admit of it . These muscles , however , after a certain time refuse to suffer further relaxation , and thus afford a second check to the evagination of the membrane . Thus we have two small permanent invaginations existing after the ...
... admit of it . These muscles , however , after a certain time refuse to suffer further relaxation , and thus afford a second check to the evagination of the membrane . Thus we have two small permanent invaginations existing after the ...
Página 40
... admit of comparison with the " winter ova " of the Rotifera and the ephippia of Daphnia remains yet to be determined . Huxley has studied the production of " winter ova " in Lacinularia , and , though he has shown these bodies to be ...
... admit of comparison with the " winter ova " of the Rotifera and the ephippia of Daphnia remains yet to be determined . Huxley has studied the production of " winter ova " in Lacinularia , and , though he has shown these bodies to be ...
Página 41
... admits at the same time that they are possibly agamic . The external resemblance of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but , with the very different origin of the two sets of bodies , we must ...
... admits at the same time that they are possibly agamic . The external resemblance of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but , with the very different origin of the two sets of bodies , we must ...
Página 43
... admits of much valuable elucidation from the study of the freshwater genera . We have seen in the historical sketch already given of the successive steps which resulted in the separation of the Polyzoa from the Polypes , that the ...
... admits of much valuable elucidation from the study of the freshwater genera . We have seen in the historical sketch already given of the successive steps which resulted in the separation of the Polyzoa from the Polypes , that the ...
Página 49
... admitting of eversion . In the Polyzoa there is , properly speaking , but one external orifice , namely , that through which the tentacular crown is projected and retracted ; but this is equivalent to the respiratory and cloacal ...
... admitting of eversion . In the Polyzoa there is , properly speaking , but one external orifice , namely , that through which the tentacular crown is projected and retracted ; but this is equivalent to the respiratory and cloacal ...
Otras ediciones - Ver todas
A Monograph of the Fresh-water Polyzoa: Including All the Known ..., Tema 28 George James Allman Vista de fragmentos - 1856 |
A Monograph of the Fresh-Water Polyzoa, Including All the Known Species ... George James Allman Sin vista previa disponible - 2009 |
Términos y frases comunes
adherent Alcyonella Alcyonella fungosa Alcyonella stagnorum alimentary canal Allman anatomy animal annulus Ascidian attached become Beneden Bowerbankia Brachiopoda branches branchial sac Brit Brux campanulata cavity cell cilia cœnocium crescentic Cristatella Cristatella mucedo d'eau douce described Difflugia disc distinct Dumortier ectocyst embryo endocyst epistome exserted external fibres flabellum fluid fresh-water Polyzoa funiculus ganglion genera genus Gervais hæmal Hancock hippocrepian Hist homologous intestine invaginated l'Acad Lamarck layer Leidy Linnæus lophophore Lophopus crystallinus margin Mém membrane memoir Meyen mouth Müller Naisa naturalists observed œsophagus organ orifice Original figures ovary ovum Paludicella parieto-vaginal muscles peculiar Pedicellina perigastric space Plumatella repens Polype à Panache polypide Polyzoon portion posterior present Raspail respiratory retraction retractor retractor muscles Rösel seen septa side species specimens statoblasts stomach structure surface tentacles tentacula tentacular crown tentacular sheath thoracic chamber transparent transverse Trembley tubes Tubularia repens tunic Tunicata Urnatella walls Zooph Zoophytes