A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 12
For reasons to be presently mentioned , it is highly probable that the endocyst is
pervaded by a system of canals of extreme delicacy , which constitute an
irregular network in its substance . Besides the structure now described , peculiar
fibres ...
For reasons to be presently mentioned , it is highly probable that the endocyst is
pervaded by a system of canals of extreme delicacy , which constitute an
irregular network in its substance . Besides the structure now described , peculiar
fibres ...
Página 16
... 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 through the transparent
...
... 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 through the transparent
...
Página 17
Delicate circular striæ may generally be distinctly observed in it , they may be
seen surrounding the stomach , and are probably muscular fibres ; they are
particularly evident in Alcyonella and Plumatella towards the fundus of the
stomach ...
Delicate circular striæ may generally be distinctly observed in it , they may be
seen surrounding the stomach , and are probably muscular fibres ; they are
particularly evident in Alcyonella and Plumatella towards the fundus of the
stomach ...
Página 20
Fig 4. Front view of lophophore and contiguous parts . Ectocyst . 6. Endocyst . C.
Invaginated portion of endocyst adherent to the bases of the tentacula and
entering into the formation of the cup . d . Muscular fibres surrounding the margin
of the ...
Fig 4. Front view of lophophore and contiguous parts . Ectocyst . 6. Endocyst . C.
Invaginated portion of endocyst adherent to the bases of the tentacula and
entering into the formation of the cup . d . Muscular fibres surrounding the margin
of the ...
Página 21
The retractor fibres are obviously homologous with the great retractor muscles of
the others . The mouth , which occupies its normal position in the body of the
lophophore , opens into an æsophagus , which after a short course terminates in
the ...
The retractor fibres are obviously homologous with the great retractor muscles of
the others . The mouth , which occupies its normal position in the body of the
lophophore , opens into an æsophagus , which after a short course terminates in
the ...
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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 ..., Tema 28 George James Allman Vista de fragmentos - 1856 |
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