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
... polyzoon has now the appearance of a trans- parent , closed sac , filled with fluid , the posterior part ciliated , the anterior destitute of cilia and partially or entirely pushed back into the posterior by a process of invagination ...
... polyzoon has now the appearance of a trans- parent , closed sac , filled with fluid , the posterior part ciliated , the anterior destitute of cilia and partially or entirely pushed back into the posterior by a process of invagination ...
Página 35
... polyzoon . The subsequent changes are produced by the gemmation of new polypides , with their proper ectocysts and endocysts . Plumatella fruticosa presents similar developmental phenomena ; the ciliated larva , however , in this ...
... polyzoon . The subsequent changes are produced by the gemmation of new polypides , with their proper ectocysts and endocysts . Plumatella fruticosa presents similar developmental phenomena ; the ciliated larva , however , in this ...
Página 38
... polyzoon 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 ...
... polyzoon 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 ...
Página 39
... 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 little polyzoon thus become ...
... 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 little polyzoon thus become ...
Página 40
... polyzoon has afforded to them a mode of egress through the orifice of the cell . In two species of fresh - water Polyzoa , Plumatella emarginata and Alcyonella Benedeni , I have observed , besides the ordinary statoblasts , another kind ...
... polyzoon has afforded to them a mode of egress through the orifice of the cell . In two species of fresh - water Polyzoa , Plumatella emarginata and Alcyonella Benedeni , I have observed , besides the ordinary statoblasts , another kind ...
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