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 16
... observed , when the polypide is exserted from its cell , to be in a constant motion , which consists in an alternate elevation and depression of the organ . The elevation is effected by distinct muscular fibres ( n ) , which are visible ...
... observed , when the polypide is exserted from its cell , to be in a constant motion , which consists in an alternate elevation and depression of the organ . The elevation is effected by distinct muscular fibres ( n ) , which are visible ...
Página 17
... observed in it , they may be seen surrounding the stomach , and are probably muscular fibres ; they are particularly evident in Alcyonella and Plumatella towards the fundus of the stomach ; they become less distinct as we ascend toward ...
... observed in it , they may be seen surrounding the stomach , and are probably muscular fibres ; they are particularly evident in Alcyonella and Plumatella towards the fundus of the stomach ; they become less distinct as we ascend toward ...
Página 18
... observed to be whirled along in the vortices caused by the action of the tentacular cilia , and conveyed to the mouth , where many of them are at once seized and swallowed , and others rejected . The food having once entered the ...
... observed to be whirled along in the vortices caused by the action of the tentacular cilia , and conveyed to the mouth , where many of them are at once seized and swallowed , and others rejected . The food having once entered the ...
Página 19
... observed , but which never possess an epistome , the lophophore in the marine genera is always orbicular . The lophophore in all the genera forms the roof of the perigastric space ; in the species with crescentic lophophores the arms of ...
... observed , but which never possess an epistome , the lophophore in the marine genera is always orbicular . The lophophore in all the genera forms the roof of the perigastric space ; in the species with crescentic lophophores the arms of ...
Página 22
... observed a constant rotatory motion , rendered apparent by the floating corpuscles as they are whirled away under ... Observations sur les Polypes d'eau douce , ' Bull . de l'Acad . Roy . de Bruxelles , ' 1839 . here in error , as indeed ...
... observed a constant rotatory motion , rendered apparent by the floating corpuscles as they are whirled away under ... Observations sur les Polypes d'eau douce , ' Bull . de l'Acad . Roy . de Bruxelles , ' 1839 . here in error , as indeed ...
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