A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 7
Let us imagine an alimentary canal , consisting of œsophagus , stomach , and intestine , to be furnished at its origin with long ciliated tentacula , and to have a single nervous ganglion situated on one side of the oesophagus .
Let us imagine an alimentary canal , consisting of œsophagus , stomach , and intestine , to be furnished at its origin with long ciliated tentacula , and to have a single nervous ganglion situated on one side of the oesophagus .
Página 16
The cavity in its interior communicates through an opening ( e ) in the lophophore with the perigastric space ; the walls which are turned towards the mouth are thick , and densely clothed on their external surface with vibratile cilia ...
The cavity in its interior communicates through an opening ( e ) in the lophophore with the perigastric space ; the walls which are turned towards the mouth are thick , and densely clothed on their external surface with vibratile cilia ...
Página 18
The mouth and upper part of the œsophagus are in all the genera clothed with vibratile cilia , but I could detect no appearance of cilia further than a short distance down this tube . The structure of the intestine ...
The mouth and upper part of the œsophagus are in all the genera clothed with vibratile cilia , but I could detect no appearance of cilia further than a short distance down this tube . The structure of the intestine ...
Página 19
... the interior of the arms is clothed with vibratile cilia . I have had an oppor* The structure of Pedicellina has been hitherto entirely misunderstood . tunity of carefully examining this Polyzoon , and as it is constructed on a plan ...
... the interior of the arms is clothed with vibratile cilia . I have had an oppor* The structure of Pedicellina has been hitherto entirely misunderstood . tunity of carefully examining this Polyzoon , and as it is constructed on a plan ...
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 ...
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 ...
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Otras ediciones - Ver todas
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 Species ... George James Allman Sin vista previa disponible - 2009 |
Términos y frases comunes
action adherent admit Alcyonella alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British 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 Hancock 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 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