A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 5
He then goes on to compare the walls of the body cavity in Gorgonia , Isis , Alcyonium , & c . , to the tunics of an Ascidian or the mantle of an ordinary Mollusc , a comparison which plainly shows that he had no idea whatever of the ...
He then goes on to compare the walls of the body cavity in Gorgonia , Isis , Alcyonium , & c . , to the tunics of an Ascidian or the mantle of an ordinary Mollusc , a comparison which plainly shows that he had no idea whatever of the ...
Página 6
Notwithstanding , however , the completeness with which the ascidian type of structure had now been recognised in the Polyzoa , naturalists had not yet emancipated themselves from the old notion that the closest affinities of these ...
Notwithstanding , however , the completeness with which the ascidian type of structure had now been recognised in the Polyzoa , naturalists had not yet emancipated themselves from the old notion that the closest affinities of these ...
Página 9
... I shall call that region of a Polyzoon on which the nervous ganglion lies the " neural , " and the opposite region , that , namely , which corresponds to the part of an Ascidian which contains the heart , the " hæmal .
... I shall call that region of a Polyzoon on which the nervous ganglion lies the " neural , " and the opposite region , that , namely , which corresponds to the part of an Ascidian which contains the heart , the " hæmal .
Página 43
Under the one head it is maintained that the respiratory sac of the Ascidian has its representative in the pharynx of the Polyzoon , and that the rudimentary tentacula at the orifice of this sac are homologous with the tentacula of the ...
Under the one head it is maintained that the respiratory sac of the Ascidian has its representative in the pharynx of the Polyzoon , and that the rudimentary tentacula at the orifice of this sac are homologous with the tentacula of the ...
Página 44
In advocating the homology of the respiratory sac of the Ascidian with the tentacular crown of the Polyzoon , some zoologists , among whom must be especially mentioned M. Van Benedent , maintain that the longitudinal bars of the sac ...
In advocating the homology of the respiratory sac of the Ascidian with the tentacular crown of the Polyzoon , some zoologists , among whom must be especially mentioned M. Van Benedent , maintain that the longitudinal bars of the sac ...
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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
action adherent admit Alcyonella alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British cavity cell character cilia closely complete condition connected consists constitutes contained continuous corresponding Cristatella described detected disc distinct Dumortier ectocyst edit endocyst entire epistome examined existence extending external extremity fibres fluid Fredericella fresh-water Polyzoa genera genus Gervais gives Hancock Hist important internal latter layer Leidy lophophore Lophopus margin mass Mém membrane memoir minute mouth muscles Natural naturalists nearly observed occur organ orifice Original figures Paludicella passes Plumatella Plumatella repens Polype polypide Polyzoon portion present published relations repens resemblance retraction retractor Rösel seen separated sheath side space species specimens statoblasts stomach stones structure surface surrounding tentacula transparent transverse Trembley true tubes Tubularia tunic Tunicata walls whole young
Información bibliográfica
| Título | A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign Volumen18 de ¬The Ray Society |
| Autor | George James Allman |
| Editor | Ray Society, 1856 |
| Procedencia del original | la Biblioteca Estatal de Baviera |
| Digitalizado | 13 Nov. 2009 |
| Largo | 119 páginas |
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