A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 16
It may be observed , when the polypide is exserted from its cell , to be in a
constant motion , which consists in an alternate elevation and depression of the
organ . The elevation is effected by distinct muscular fibres ( n ) , which are visible
...
It may be observed , when the polypide is exserted from its cell , to be in a
constant motion , which consists in an alternate elevation and depression of the
organ . The elevation is effected by distinct muscular fibres ( n ) , which are visible
...
Página 19
... chiefly to devolve the function of bringing under the influence of the aërating
medium the nutritious fluid of their tissues . The tentacular crown of a Polyzoon
consists of two portions , namely , first , a sort of stage or disc ( the lophophore ) (
Pl ...
... chiefly to devolve the function of bringing under the influence of the aërating
medium the nutritious fluid of their tissues . The tentacular crown of a Polyzoon
consists of two portions , namely , first , a sort of stage or disc ( the lophophore ) (
Pl ...
Página 20
The external layer consists of rounded cells filled with a colourless fluid , and
often presenting a bright nucleus . Some of those cells which lie upon the back of
the tentacle become in certain genera enlarged , giving a vesicular appearance
to ...
The external layer consists of rounded cells filled with a colourless fluid , and
often presenting a bright nucleus . Some of those cells which lie upon the back of
the tentacle become in certain genera enlarged , giving a vesicular appearance
to ...
Página 22
That the fluid thus contained in the perigastric space , and thence admitted into
the tentacula , consists mainly of water which had obtained entrance from without
, there can , I think , be little doubt , and yet I have in vain sought for any opening
...
That the fluid thus contained in the perigastric space , and thence admitted into
the tentacula , consists mainly of water which had obtained entrance from without
, there can , I think , be little doubt , and yet I have in vain sought for any opening
...
Página 23
If it be admitted , as I think it must be , that the perigastric fluid consists mainly of
water which has obtained entrance from without , it then corresponds to a true
aquiferous system subservient to a respiratory function . But it also without doubt
...
If it be admitted , as I think it must be , that the perigastric fluid consists mainly of
water which has obtained entrance from without , it then corresponds to a true
aquiferous system subservient to a respiratory function . But it also without doubt
...
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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 admit Alcyonella alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British cænæcium cavity cell character cilia closely complete condition connected consists constitutes contained continuous corresponding Cristatella described detected disc distinct Dumortier ectocyst edit endocyst entire epistome examined existence extending external extremity fibres fluid Fredericella fresh-water Polyzoa genera genus Gervais gives Hist important internal latter layer Leidy lophophore Lophopus margin mass Mém membrane memoir minute mouth muscles Natural naturalists nearly observed occur organ orifice Original figures Paludicella passes Plumatella Plumatella repens Polype polypide Polyzoon portion present published relations repens represented resemblance retraction retractor Rösel seen separated sheath side space species specimens statoblasts stomach stones structure surface surrounding tentacula transparent transverse Trembley true tubes Tubularia tunic Tunicata walls whole young
Información bibliográfica
| Título | A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, George James Allman Volumen13 de DE-601)130488305: Ray Society Publications, Ray Society Ray Society, Ray Society Volumen28 de Ray society ... [Publications |
| Autor | George James Allman |
| Editor | Ray Society, 1856 |
| Procedencia del original | la Biblioteca Estatal de Baviera |
| Digitalizado | 13 Nov. 2009 |
| Largo | 119 páginas |
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