A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 7
7 ANATOMY AND PHYSIOLOGY . . 1 . PRELIMINARY MATTER . General
conception of a Polyzoon . Fig . 1 . e Fig . 2 . 9 1 b 19 PLAN OF A POLYZOON .
Fig . 1. Exserted . Fig . 2. Retracted . a . Region of mouth , surrounded by
tentacles . 6.
7 ANATOMY AND PHYSIOLOGY . . 1 . PRELIMINARY MATTER . General
conception of a Polyzoon . Fig . 1 . e Fig . 2 . 9 1 b 19 PLAN OF A POLYZOON .
Fig . 1. Exserted . Fig . 2. Retracted . a . Region of mouth , surrounded by
tentacles . 6.
Página 14
The structure of this body is remarkable ; it consists of a central mass ,
surrounded by a distinct layer of somewhat elongated cellules placed
perpendicularly to its surface . The body which thus closes up the centre of the
annular septum has ...
The structure of this body is remarkable ; it consists of a central mass ,
surrounded by a distinct layer of somewhat elongated cellules placed
perpendicularly to its surface . The body which thus closes up the centre of the
annular septum has ...
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
stomach ...
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
stomach ...
Página 19
nutritious ' elements , portions in the form of roundish pellets become separated
at intervals from the mass , and are slowly propelled along the tube towards the
anus , where , having arrived , they are suddenly ejected into the surrounding ...
nutritious ' elements , portions in the form of roundish pellets become separated
at intervals from the mass , and are slowly propelled along the tube towards the
anus , where , having arrived , they are suddenly ejected into the surrounding ...
Página 20
Fig 4. Front view of lophophore and contiguous parts . Ectocyst . 6. Endocyst . C.
Invaginated portion of endocyst adherent to the bases of the tentacula and
entering into the formation of the cup . d . Muscular fibres surrounding the margin
of the ...
Fig 4. Front view of lophophore and contiguous parts . Ectocyst . 6. Endocyst . C.
Invaginated portion of endocyst adherent to the bases of the tentacula and
entering into the formation of the cup . d . Muscular fibres surrounding the margin
of the ...
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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 canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British cćnćcium 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 organ orifice Original figures Paludicella passes Plumatella Plumatella repens Polype polypide Polyzoon portion present published relations repens represented 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