A Monograph of the Freshwater Polyzoa, Including All the Known Species, Both British and Foreign |
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Página 5
... organisation que les Mollusques Ascidiens.” He then goes on to compare the
walls of the body cavity in Gorgonia, Isis, Alcyonium, &c., to the tunics of an
Ascidian or the mantle of an ordinary Mollusc, a comparison which plainly shows
that ...
... organisation que les Mollusques Ascidiens.” He then goes on to compare the
walls of the body cavity in Gorgonia, Isis, Alcyonium, &c., to the tunics of an
Ascidian or the mantle of an ordinary Mollusc, a comparison which plainly shows
that ...
Página 11
Each chamber lodges a polypide, and its cavity is either shut off from those of the
neighbouring chambers, or freely communicates with them. In every instance" the
polypide can be protruded from its cell, and again withdrawn into it, and the ...
Each chamber lodges a polypide, and its cavity is either shut off from those of the
neighbouring chambers, or freely communicates with them. In every instance" the
polypide can be protruded from its cell, and again withdrawn into it, and the ...
Página 12
In the midst of this a minute vacuola next shows itself; this becomes the cell-cavity
, and gradually increases in size with the enlarging cell; the nucleus is persistent,
remaining attached to the cell-wall. For reasons to be presently mentioned, it is ...
In the midst of this a minute vacuola next shows itself; this becomes the cell-cavity
, and gradually increases in size with the enlarging cell; the nucleus is persistent,
remaining attached to the cell-wall. For reasons to be presently mentioned, it is ...
Página 13
They are about the oth of an inch in the longer diameter, larger at one end than at
the other, and in the large end they appear to contain a minute cavity (fig. 14),
which under the action of acetic acid dilates and fills nearly the entire corpuscle ...
They are about the oth of an inch in the longer diameter, larger at one end than at
the other, and in the large end they appear to contain a minute cavity (fig. 14),
which under the action of acetic acid dilates and fills nearly the entire corpuscle ...
Página 14
The septum thus formed is rendered complete by the aperture in its centre being
closed by a peculiar body, which projects into the cavity of the cell at each side.
The structure of this body is remarkable ; it consists of a central mass, surrounded
...
The septum thus formed is rendered complete by the aperture in its centre being
closed by a peculiar body, which projects into the cavity of the cell at each side.
The structure of this body is remarkable ; it consists of a central mass, surrounded
...
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Términos y frases comunes
adherent admit Alcyonella alimentary alimentary canal Allman already anatomy animal appearance attached become Beneden bodies branches branchial British canal cavity cell characters cilia closely coenoecium 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 organ orifice Original figures Paludicella passes Plumatella Plumatella repens Polype polypide Polyzoon portion present published relations repens resemblance retraction retractor 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 Freshwater Polyzoa, Including All the Known Species, Both British and Foreign Volumen18 de ¬The Ray Society |
| Autor | George James Allman |
| Editor | Ray Society, 1856 |
| Procedencia del original | la Biblioteca Estatal de Baviera |
| Digitalizado | 13 Nov. 2009 |
| Exportar cita | BiBTeX EndNote RefMan |