A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 12
Besides the structure now described , peculiar fibres ( Pl . II , fig . 10 ) are also developed in the endocyst . These are situated on its inner surface , where they constitute a well - marked layer composed of a network of transverse ...
Besides the structure now described , peculiar fibres ( Pl . II , fig . 10 ) are also developed in the endocyst . These are situated on its inner surface , where they constitute a well - marked layer composed of a network of transverse ...
Página 16
It may be observed , when the polypide is exserted from its cell , to be in a constant motion , which consists in an alternate elevation and depression of the organ . The elevation is effected by distinct muscular fibres ( n ) , which ...
It may be observed , when the polypide is exserted from its cell , to be in a constant motion , which consists in an alternate elevation and depression of the organ . The elevation is effected by distinct muscular fibres ( n ) , which ...
Página 17
Delicate circular strić 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 strić 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 ...
Página 20
Muscular fibres surrounding the margin of the cup . e . Mouth . f . ( Esophagus . g . Stomach . h . Rectum . i . Anus . k . Epistome . 1. Ganglion . m . Generative organ . n . Retractor muscle . 0. Lophophore .
Muscular fibres surrounding the margin of the cup . e . Mouth . f . ( Esophagus . g . Stomach . h . Rectum . i . Anus . k . Epistome . 1. Ganglion . m . Generative organ . n . Retractor muscle . 0. Lophophore .
Página 21
The retractor fibres are obviously homologous with the great retractor muscles of the others . The mouth , which occupies its normal position in the body of the lophophore , opens into au ...
The retractor fibres are obviously homologous with the great retractor muscles of the others . The mouth , which occupies its normal position in the body of the lophophore , opens into au ...
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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
adherent admit Alcyonella alimentary alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British cćnćcium canal 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 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 structure surface surrounding tentacula transparent transverse Trembley true tubes Tubularia tunic Tunicata walls whole young