A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 7
Retractor muscle . 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 ...
Retractor muscle . 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 ...
Página 8
surface a secondary investment of very various constitution in the different groups ; and we may , moreover , conceive of the entire animal with its digestive tube , tentacula , ganglion , muscles , generative organs , circumambient ...
surface a secondary investment of very various constitution in the different groups ; and we may , moreover , conceive of the entire animal with its digestive tube , tentacula , ganglion , muscles , generative organs , circumambient ...
Página 12
There can be no doubt that these fibres of the endocyst are muscular , and that it is to their presence that the high degree of contractility enjoyed by the endocyst of Lophopus is in a great measure , if not entirely , due .
There can be no doubt that these fibres of the endocyst are muscular , and that it is to their presence that the high degree of contractility enjoyed by the endocyst of Lophopus is in a great measure , if not entirely , due .
Página 16
... 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 walls , and will be afterwards more particularly ...
... 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 walls , and will be afterwards more particularly ...
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 ...
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 ...
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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