A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 14
The part of the ectocyst to which the ribs are attached is carried inwards during
extreme retraction of the polypide . These ribs I look upon as the true homologue
of the seta which crown the cell in Bowerbankia and other ctenostomatous ...
The part of the ectocyst to which the ribs are attached is carried inwards during
extreme retraction of the polypide . These ribs I look upon as the true homologue
of the seta which crown the cell in Bowerbankia and other ctenostomatous ...
Página 17
... and presents here a well - marked constriction ; in extreme retraction of the
polypide it is bent back upon the rest of the stomach . The great cavity ( 9 ) of the
stomach is of a nearly cylindrical figure ; from its upper extremity arises the
intestine ...
... and presents here a well - marked constriction ; in extreme retraction of the
polypide it is bent back upon the rest of the stomach . The great cavity ( 9 ) of the
stomach is of a nearly cylindrical figure ; from its upper extremity arises the
intestine ...
Página 21
In order to understand this relation , it is necessary to conceive of the polypide as
partially retracted ; the invaginated portion of ... From this arrangement it is
obvious , that the exsertion and retraction of the polypide must be When the
polypide ...
In order to understand this relation , it is necessary to conceive of the polypide as
partially retracted ; the invaginated portion of ... From this arrangement it is
obvious , that the exsertion and retraction of the polypide must be When the
polypide ...
Página 24
The action of the retractor muscles is very obvious ; having a comparatively fixed
point of attachment near the bottom of the cell , they retract the whole alimentary
canal with the tentacular crown , so as to place them in a state of security in the ...
The action of the retractor muscles is very obvious ; having a comparatively fixed
point of attachment near the bottom of the cell , they retract the whole alimentary
canal with the tentacular crown , so as to place them in a state of security in the ...
Página 26
Though a contraction of the endocyst at this spot , as if occasioned by the action
of a powerful sphincter , may be always observed when the polypide is
completely retracted , yet the demonstration of an actual muscle is by no means
easy .
Though a contraction of the endocyst at this spot , as if occasioned by the action
of a powerful sphincter , may be always observed when the polypide is
completely retracted , yet the demonstration of an actual muscle is by no means
easy .
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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 alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British cænæcium canal cavity cell character cilia closely complete condition connected consists constitutes contained continuous corresponding Cristatella crown 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 important internal latter layer Leidy lophophore Lophopus margin mass Mém membrane memoir minute mouth muscles Natural naturalists nearly observed occur organs orifice Original figures Paludicella passes Plumatella Plumatella repens Polype polypide Polyzoon portion present published relations repens resemblance retraction retractor Rösel seen separated sheath side space species specimens statoblasts stomach 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 | Biblioteca Nacional de Austria |
| Digitalizado | 12 Mayo 2011 |
| Largo | 119 páginas |
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