A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 7
Retracted . a . Region of mouth , surrounded by tentacles . b . Alimentary canal . c
. Anus . d . Nervous ganglion . e . ... the retraction being accompanied by an
invagination of the sac so as partially or entirely to include the oral tentacula
within it ...
Retracted . a . Region of mouth , surrounded by tentacles . b . Alimentary canal . c
. Anus . d . Nervous ganglion . e . ... the retraction being accompanied by an
invagination of the sac so as partially or entirely to include the oral tentacula
within it ...
Página 28
The action of the anterior parieto - vaginal muscles assists in the invagination of
the tube , and dilates it when completely retracted ; they thus act as antagonistic
to the vaginal sphincter , while the posterior fibres will check the complete ...
The action of the anterior parieto - vaginal muscles assists in the invagination of
the tube , and dilates it when completely retracted ; they thus act as antagonistic
to the vaginal sphincter , while the posterior fibres will check the complete ...
Página 49
8 , 9 , page 45 ) does to the corresponding parts of these during the retracted
state of the animal ; it scarcely differs , in fact ... Those muscles on which devolves
the office of the retraction of the polypide in the Polyzoa are of course absent in
the ...
8 , 9 , page 45 ) does to the corresponding parts of these during the retracted
state of the animal ; it scarcely differs , in fact ... Those muscles on which devolves
the office of the retraction of the polypide in the Polyzoa are of course absent 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 |
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