A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
Dentro del libro
Resultados 11-15 de 36
Página 29
... condition , being obliterated on the com- pletion of the act . When the protrusion of the polypide is completed , the last act in all the species is the display of the tentacula , which had previously been all drawn together into a ...
... condition , being obliterated on the com- pletion of the act . When the protrusion of the polypide is completed , the last act in all the species is the display of the tentacula , which had previously been all drawn together into a ...
Página 30
... condition , however , which is not at all times equally perceptible ; and some of our best observers have denied to the Polyzoa the existence of striated fibre . I have , however , by repeated observations , satisfied myself of the ...
... condition , however , which is not at all times equally perceptible ; and some of our best observers have denied to the Polyzoa the existence of striated fibre . I have , however , by repeated observations , satisfied myself of the ...
Página 33
... condition thus induced has in its turn vanished , we find that the contents of the egg have assumed the form of a roundish or oval body ( Pl . XI , fig . 29 ) , richly ciliated on its surface , and provided with a large central cavity ...
... condition thus induced has in its turn vanished , we find that the contents of the egg have assumed the form of a roundish or oval body ( Pl . XI , fig . 29 ) , richly ciliated on its surface , and provided with a large central cavity ...
Página 35
... condition the little animal assumes a piriform figure , with the small end corresponding to the aperture . It is thus carried through the surrounding fluid by the vibration of its cilia , performing rapid and elegant motions , always ...
... condition the little animal assumes a piriform figure , with the small end corresponding to the aperture . It is thus carried through the surrounding fluid by the vibration of its cilia , performing rapid and elegant motions , always ...
Página 38
... condition . In some cases , however , the cellular condition of one or both discs is very obscure . The annulus is also composed of cells , which here occur in several layers ; these cells are also for the most part larger than those of ...
... condition . In some cases , however , the cellular condition of one or both discs is very obscure . The annulus is also composed of cells , which here occur in several layers ; these cells are also for the most part larger than those of ...
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 crescentic Cristatella Cristatella mucedo d'eau douce described Difflugia disc distinct Dumortier ectocyst Ehrenbergi 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 longitudinal lophophore Lophopus crystallinus margin Mém membrane memoir Meyen mouth Müller Naisa naturalists observed oesophagus 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