A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 33
In this polyzoon the mature ovum consists of a granular vitellus , surrounded by a
very evident vitellary membrane , on ... When liberated from the outer membrane
of the ovum , which still confines it , it swims actively through the surrounding ...
In this polyzoon the mature ovum consists of a granular vitellus , surrounded by a
very evident vitellary membrane , on ... When liberated from the outer membrane
of the ovum , which still confines it , it swims actively through the surrounding ...
Página 38
... most part larger than those of the disc and of a different colour ; they are filled
with air , giving to the annulus a light spongy texture , and act as a float by which
the statoblast , when set free , is kept near the surface of the surrounding water .
... most part larger than those of the disc and of a different colour ; they are filled
with air , giving to the annulus a light spongy texture , and act as a float by which
the statoblast , when set free , is kept near the surface of the surrounding water .
Página 39
The statoblast has now acquired the complete form characteristic of the species ,
and , breaking loose from the funiculus , it falls free into the perigastric space , still
surrounded by the delicate external transparent membrane , which is soon torn ...
The statoblast has now acquired the complete form characteristic of the species ,
and , breaking loose from the funiculus , it falls free into the perigastric space , still
surrounded by the delicate external transparent membrane , which is soon torn ...
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Términos y frases comunes
adherent admit Alcyonella alimentary alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British canal cavity cell character cilia closely complete condition connected consists constitutes contained continuous 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 Hist 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 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 | Universidad de Illinois en Urbana-Champaign |
| Digitalizado | 13 Oct. 2015 |
| Largo | 119 páginas |
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