A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 37
Statoblasts . In all the fresh - water phylactolæmatous Polyzoa , bodies of a very peculiar nature occur at certain ... From the earliest period that the fresh - water Polyzoa became an object of study , the statoblasts attracted the ...
Statoblasts . In all the fresh - water phylactolæmatous Polyzoa , bodies of a very peculiar nature occur at certain ... From the earliest period that the fresh - water Polyzoa became an object of study , the statoblasts attracted the ...
Página 38
When the statoblasts are placed under circumstances favouring their development , they open by the separation from one another of the two faces , and there then escapes from them a young polyzoon already in an advanced ...
When the statoblasts are placed under circumstances favouring their development , they open by the separation from one another of the two faces , and there then escapes from them a young polyzoon already in an advanced ...
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 ...
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 ...
Página 40
In two species of fresh - water Polyzoa , Plumatella emarginata and Alcyonella Benedeni , I have observed , besides the ordinary statoblasts , another kind which is characterised by some peculiarities . In both these Polyzoa the cells ...
In two species of fresh - water Polyzoa , Plumatella emarginata and Alcyonella Benedeni , I have observed , besides the ordinary statoblasts , another kind which is characterised by some peculiarities . In both these Polyzoa the cells ...
Página 41
The external resemblance of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but , with the very different origin of the two sets of bodies , we must take care not to attribute a greater share of significance ...
The external resemblance of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but , with the very different origin of the two sets of bodies , we must take care not to attribute a greater share of significance ...
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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