A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 64
on closely allied Polyzoa , he has fallen far short of these naturalists in tracing the
intermediate course of the alimentary canal . His ideas on this part of the structure
seem to correspond very closely with those of Rösel , and he joins with this ...
on closely allied Polyzoa , he has fallen far short of these naturalists in tracing the
intermediate course of the alimentary canal . His ideas on this part of the structure
seem to correspond very closely with those of Rösel , and he joins with this ...
Página 89
A vertical section shows it to be composed of a vast number of tough , membrano
- corneous - branched tubes , closely adherent to one another , and each
opening on the surface by one of the angular orifices , just mentioned . Imperfect
...
A vertical section shows it to be composed of a vast number of tough , membrano
- corneous - branched tubes , closely adherent to one another , and each
opening on the surface by one of the angular orifices , just mentioned . Imperfect
...
Página 99
These two variations are quite accidental , and altogether the result of external
agencies influencing the growth of the species ; indeed , the very same specimen
will often exhibit both at the same time , continuing closely adherent to the stone ...
These two variations are quite accidental , and altogether the result of external
agencies influencing the growth of the species ; indeed , the very same specimen
will often exhibit both at the same time , continuing closely adherent to the stone ...
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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 characters cilia closely complete condition connected consists constitutes contained continuous corresponding 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 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