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 33
... surrounded by a very evident vitellary membrane , on whose internal surface the contents appear frequently to be ... surrounding water by the aid of the cilia with which it is invested . As development proceeds , we find the ciliated ...
... surrounded by a very evident vitellary membrane , on whose internal surface the contents appear frequently to be ... surrounding water by the aid of the cilia with which it is invested . As development proceeds , we find the ciliated ...
Página 34
... length , giving way , allows the embryo to escape . The free embryo ( Pl . XI , figs . 32 , 33 , 33 , 33 ' ) now swims actively through the surrounding fluid of the perigastric space . It sometimes remains stationary 34 EMBRYOLOGY .
... length , giving way , allows the embryo to escape . The free embryo ( Pl . XI , figs . 32 , 33 , 33 , 33 ' ) now swims actively through the surrounding fluid of the perigastric space . It sometimes remains stationary 34 EMBRYOLOGY .
Página 35
... surrounding fluid by the vibration of its cilia , performing rapid and elegant motions , always swimming with the broad end foremost , and at the same time revolving gracefully on its axis . The complete evagination of the unciliated ...
... surrounding fluid by the vibration of its cilia , performing rapid and elegant motions , always swimming with the broad end foremost , and at the same time revolving gracefully on its axis . The complete evagination of the unciliated ...
Página 38
... surrounding water . When the statoblasts are placed under circumstances favouring their development , they open by ... surrounded by a denser layer , which is continuous with the surface of the funiculus . The swelling now increases in ...
... surrounding water . When the statoblasts are placed under circumstances favouring their development , they open by ... surrounded by a denser layer , which is continuous with the surface of the funiculus . The swelling now increases in ...
Página 39
... surrounded by the delicate external transparent membrane , which is soon torn and disappears . When exposed to ... surrounding water ; this phe- nomenon I have observed in Cristatella , and several species of Plumatella ( figs . 42 ...
... surrounded by the delicate external transparent membrane , which is soon torn and disappears . When exposed to ... surrounding water ; this phe- nomenon I have observed in Cristatella , and several species of Plumatella ( figs . 42 ...
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