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 29
This second portion of the invaginated membrane , which in the retracted state
constitutes the tentacular sheath , continues to be carried outwards by the
advancing polypide , the posterior parieto - vaginal muscles slowly relaxing to
admit of it .
This second portion of the invaginated membrane , which in the retracted state
constitutes the tentacular sheath , continues to be carried outwards by the
advancing polypide , the posterior parieto - vaginal muscles slowly relaxing to
admit of it .
Página 48
The main tube , with its lateral pinnæ , thus constitutes an imperfect diaphragm ,
which divides the great thoracic chamber into an anterior or branchial portion ,
and a posterior or cloacal portion . Now the main tube may be obviously
compared ...
The main tube , with its lateral pinnæ , thus constitutes an imperfect diaphragm ,
which divides the great thoracic chamber into an anterior or branchial portion ,
and a posterior or cloacal portion . Now the main tube may be obviously
compared ...
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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 characters 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 stones structure surface surrounding tentacula transparent transverse Trembley true tubes Tubularia tunic Tunicata walls whole young