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 35
... whole colony a greater regularity than is met with in the other branched forms of the fresh- water Polyzoa . Most of the steps in the development of the gemma may be traced with considerable facility in Paludicella . In the earliest ...
... whole colony a greater regularity than is met with in the other branched forms of the fresh- water Polyzoa . Most of the steps in the development of the gemma may be traced with considerable facility in Paludicella . In the earliest ...
Página 38
... whole body now assumes a more lenticular form , and within the external envelope two other investments begin to show them- selves . One of these ( the more internal ) extends over the whole surface of the cellular con- tents , but the ...
... whole body now assumes a more lenticular form , and within the external envelope two other investments begin to show them- selves . One of these ( the more internal ) extends over the whole surface of the cellular con- tents , but the ...
Página 39
... whole be now crushed , under the microscope , multitudes of cells will escape , all filled with minute , strongly refracting corpuscles ( fig . 41 , 41 , 41 ' ) ; but any further observation of the progressive develop- ment of the ...
... whole be now crushed , under the microscope , multitudes of cells will escape , all filled with minute , strongly refracting corpuscles ( fig . 41 , 41 , 41 ' ) ; but any further observation of the progressive develop- ment of the ...
Página 41
... whole process of generation and gemmation in these animals within the domain of the so - called " Law of alternation of generations . " We have , first , as the immediate result of the development of the ovum , a ciliated sac - like ...
... whole process of generation and gemmation in these animals within the domain of the so - called " Law of alternation of generations . " We have , first , as the immediate result of the development of the ovum , a ciliated sac - like ...
Página 42
... whole organization becomes so completely subordinate to the reproductive function as to be entirely masked , and apparently replaced by the generative organs . This would then constitute a third zooid , which would therefore be a sexual ...
... whole organization becomes so completely subordinate to the reproductive function as to be entirely masked , and apparently replaced by the generative organs . This would then constitute a third zooid , which would therefore be a sexual ...
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