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 34
... entire evagination of the membrane , but after a time they disappear , and then the unlining and evagination are perfect . In the interior of the protrusible portion , and before the disappearance of the transverse bands , a polypide is ...
... entire evagination of the membrane , but after a time they disappear , and then the unlining and evagination are perfect . In the interior of the protrusible portion , and before the disappearance of the transverse bands , a polypide is ...
Página 35
... entire sac becomes enveloped in an ectocyst , to constitute the cell of the adult polyzoon . The subsequent changes are produced by the gemmation of new polypides , with their proper ectocysts and endocysts . Plumatella fruticosa ...
... entire sac becomes enveloped in an ectocyst , to constitute the cell of the adult polyzoon . The subsequent changes are produced by the gemmation of new polypides , with their proper ectocysts and endocysts . Plumatella fruticosa ...
Página 37
... entire margin , and is of a different structure from the disc ( Pl . I , figs . 3-8 ; Pl . IV , figs . 4 , 5 ; & c . ) In Fredericella alone is the marginal ring so little developed as to be scarcely apparent . In all , one side would ...
... entire margin , and is of a different structure from the disc ( Pl . I , figs . 3-8 ; Pl . IV , figs . 4 , 5 ; & c . ) In Fredericella alone is the marginal ring so little developed as to be scarcely apparent . In all , one side would ...
Página 41
... entire mass into two separate portions , which move off in opposite directions . In Lophopus the process is very similar ; large specimens of this polyzoon have the endocyst constricted at intervals so as to give to the colony the ...
... entire mass into two separate portions , which move off in opposite directions . In Lophopus the process is very similar ; large specimens of this polyzoon have the endocyst constricted at intervals so as to give to the colony the ...
Página 56
... entire margin of the crescent was borne , in uninterrupted succession , a series of ciliated tentacula , surrounded at their base by a membrane resembling the calyx of a phylactolæmatous Polyzoon . So far the structure is absolutely ...
... entire margin of the crescent was borne , in uninterrupted succession , a series of ciliated tentacula , surrounded at their base by a membrane resembling the calyx of a phylactolæmatous Polyzoon . So far the structure is absolutely ...
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