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 22
... seen this space rapidly empty itself on the removal of the animal from the water , and again fill on restoring it to its natural element . Van Benedens believed that he had detected in Alcyonella apertures , which he names " bouches ...
... seen this space rapidly empty itself on the removal of the animal from the water , and again fill on restoring it to its natural element . Van Benedens believed that he had detected in Alcyonella apertures , which he names " bouches ...
Página 24
... seen these cilia , not only on the walls of the perigastric space , but on the external surface of the alimentary canal . I cannot , however , confirm their existence in the latter situation ; indeed , my own observations are entirely ...
... seen these cilia , not only on the walls of the perigastric space , but on the external surface of the alimentary canal . I cannot , however , confirm their existence in the latter situation ; indeed , my own observations are entirely ...
Página 27
... seen very distinctly towards the anterior extremity of the cell , but it is not always easy to determine how far backwards they extend , as in most cases , the internal structures soon become concealed under the increasing opacity of ...
... seen very distinctly towards the anterior extremity of the cell , but it is not always easy to determine how far backwards they extend , as in most cases , the internal structures soon become concealed under the increasing opacity of ...
Página 29
... seen under a proper illumi- nation to consist of a membrane doubled into itself , is nothing else than the imperfectly evaginated tentacular sheath . It may be witnessed during the act of protrusion in Plumatella and other genera ; but ...
... seen under a proper illumi- nation to consist of a membrane doubled into itself , is nothing else than the imperfectly evaginated tentacular sheath . It may be witnessed during the act of protrusion in Plumatella and other genera ; but ...
Página 30
... seen this state beautifully marked through the pellucid cell in the whole extent of the retractor muscle while the fibres were on the stretch in the exserted condition of the polypide ; and in all the other genera which I have had an ...
... seen this state beautifully marked through the pellucid cell in the whole extent of the retractor muscle while the fibres were on the stretch in the exserted condition of the polypide ; and in all the other genera which I have had an ...
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