A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 37
Statoblasts . In all the fresh - water phylactolæmatous Polyzoa , bodies of a very
peculiar nature occur at certain seasons ... From the earliest period that the fresh
- water Polyzoa became an object of study , the statoblasts attracted the attention
...
Statoblasts . In all the fresh - water phylactolæmatous Polyzoa , bodies of a very
peculiar nature occur at certain seasons ... From the earliest period that the fresh
- water Polyzoa became an object of study , the statoblasts attracted the attention
...
Página 39
The statoblast has now acquired the complete form characteristic of the species ,
and , breaking loose from the funiculus , it falls free into the perigastric space , still
surrounded by the delicate external transparent membrane , which is soon torn ...
The statoblast has now acquired the complete form characteristic of the species ,
and , breaking loose from the funiculus , it falls free into the perigastric space , still
surrounded by the delicate external transparent membrane , which is soon torn ...
Página 41
He has traced the formation of the ephippial ova in the ovary as true ova ; but
admits at the same time that they are possibly agamic . The external resemblance
of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but ,
with ...
He has traced the formation of the ephippial ova in the ovary as true ova ; but
admits at the same time that they are possibly agamic . The external resemblance
of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but ,
with ...
Página 57
... in a letter addressed to Bonnet , and quoted by this philosopher in his ·
Considérations sur les Corps Organisés , ' * Trembley describes with great
accuracy the statoblasts of a fresh - water vessel the current of blood was
intermittent .
... in a letter addressed to Bonnet , and quoted by this philosopher in his ·
Considérations sur les Corps Organisés , ' * Trembley describes with great
accuracy the statoblasts of a fresh - water vessel the current of blood was
intermittent .
Página 58
He naturally considered these statoblasts as eggs . In the • Transactions of the
Royal Academy of Sciences of Stockholm , for the year 1746 , is a memoir on
fresh - water polypes , by Bæck . * In this memoir two kinds of Polyzoa are
described ...
He naturally considered these statoblasts as eggs . In the • Transactions of the
Royal Academy of Sciences of Stockholm , for the year 1746 , is a memoir on
fresh - water polypes , by Bæck . * In this memoir two kinds of Polyzoa are
described ...
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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 ..., Tema 28 George James Allman Vista de fragmentos - 1856 |
Términos y frases comunes
adherent admit Alcyonella alimentary canal Allman already anatomy animal appearance Ascidian attached become Beneden bodies branches branchial British cænæcium 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