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 38
... already in an advanced stage of development , and in all essential points re- sembling the adult individual in whose cell the statoblasts were produced ( Pl . XI , figs . 42 , 43 ) . The statoblasts have been always viewed and described ...
... already in an advanced stage of development , and in all essential points re- sembling the adult individual in whose cell the statoblasts were produced ( Pl . XI , figs . 42 , 43 ) . The statoblasts have been always viewed and described ...
Página 39
... already said , and a young polyzoon gradually emerges and floats away freely through the surrounding water ; this phe- nomenon I have observed in Cristatella , and several species of Plumatella ( figs . 42 , 43 ) . The sur- face of the ...
... already said , and a young polyzoon gradually emerges and floats away freely through the surrounding water ; this phe- nomenon I have observed in Cristatella , and several species of Plumatella ( figs . 42 , 43 ) . The sur- face of the ...
Página 43
... already given of the successive steps which resulted in the separation of the Polyzoa from the Polypes , that the molluscan relations of the Polyzoa began at last to be recognised in an obvious resemblance between their organization and ...
... already given of the successive steps which resulted in the separation of the Polyzoa from the Polypes , that the molluscan relations of the Polyzoa began at last to be recognised in an obvious resemblance between their organization and ...
Página 46
... already prepared by their absence in Salpa and other Tunicates . In connection with the tentacular crown , there is another part of the organization of the Polyzoa for which we have still to find an equivalent , and which without ...
... already prepared by their absence in Salpa and other Tunicates . In connection with the tentacular crown , there is another part of the organization of the Polyzoa for which we have still to find an equivalent , and which without ...
Página 48
... already become obsolete in Fredericella , in which , however , the lophophore still retains a bilateral figure , which is rendered still more decided by the presence of the epistome . In the marine genus . Lagenella , the epistome has ...
... already become obsolete in Fredericella , in which , however , the lophophore still retains a bilateral figure , which is rendered still more decided by the presence of the epistome . In the marine genus . Lagenella , the epistome has ...
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