A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign, Tema 28 |
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Página 20
The external layer consists of rounded cells filled with a colourless fluid , and
often presenting a bright nucleus . Some of those cells which lie upon the back of
the tentacle become in certain genera enlarged , giving a vesicular appearance
to ...
The external layer consists of rounded cells filled with a colourless fluid , and
often presenting a bright nucleus . Some of those cells which lie upon the back of
the tentacle become in certain genera enlarged , giving a vesicular appearance
to ...
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 68
The author gives a good account of the habits and external characters of the
animal ; but he informs us of no new fact concerning its anatomy . In 1838 ,
Johnston published the first edition of his excellent History of British Zoophytes ; '
f in the ...
The author gives a good account of the habits and external characters of the
animal ; but he informs us of no new fact concerning its anatomy . In 1838 ,
Johnston published the first edition of his excellent History of British Zoophytes ; '
f in 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 |
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 character cilia closely complete condition connected consists constitutes contained continuous 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 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 stones structure surface surrounding tentacula transparent transverse Trembley true tubes Tubularia tunic Tunicata walls whole young