A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 20
The tentacula are tubular , closed at their free extremity , and opening by the
opposite through the lophophore into the perigastric space ; in all the Polyzoa
they are armed upon their opposed sides with vibratile cilia , arranged in a single
...
The tentacula are tubular , closed at their free extremity , and opening by the
opposite through the lophophore into the perigastric space ; in all the Polyzoa
they are armed upon their opposed sides with vibratile cilia , arranged in a single
...
Página 36
It is the rudimental polypide , and we soon find in it a cavity , which is to become
that of the tentacular sheath , within which ... The central space between the
rudimental tentacula is prolonged downwards , constituting the first trace of a
pharynx ...
It is the rudimental polypide , and we soon find in it a cavity , which is to become
that of the tentacular sheath , within which ... The central space between the
rudimental tentacula is prolonged downwards , constituting the first trace of a
pharynx ...
Página 46
the calyx - like membrane adherent to the outer side of the tentacula in
Fredericella and the Hippocrepian Polyzoa . This correspondence will be
rendered more obvious by imagining the branchial sinus to be depressed
towards the neural side ...
the calyx - like membrane adherent to the outer side of the tentacula in
Fredericella and the Hippocrepian Polyzoa . This correspondence will be
rendered more obvious by imagining the branchial sinus to be depressed
towards the neural side ...
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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