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 tentacula are connected to one another at their base by a membrane which
adheres to their hack , extending forwards for about one third of their length , and
constituting a cup . This membrane passes uninterruptedly from the extremity of ...
The tentacula are connected to one another at their base by a membrane which
adheres to their hack , extending forwards for about one third of their length , and
constituting a cup . This membrane passes uninterruptedly from the extremity of ...
Página 21
The hepatic layer , which , in other Polyzoa , forms a continuous lining extending
over nearly the whole of the internal surface of the stomach , is here confined to
the anterior portion of this sac , in the space between the cardiac and pyloric ...
The hepatic layer , which , in other Polyzoa , forms a continuous lining extending
over nearly the whole of the internal surface of the stomach , is here confined to
the anterior portion of this sac , in the space between the cardiac and pyloric ...
Página 23
These currents , which extend into the tentacular crown , were long ago observed
by Trembley || in Lophopus crystallinus ; but this author contented himself with
simply recording their existence , and made no attempt to explain them .
These currents , which extend into the tentacular crown , were long ago observed
by Trembley || in Lophopus crystallinus ; but this author contented himself with
simply recording their existence , and made no attempt to explain them .
Página 26
7 , 8 ) , which arise all round from the inner surface of the endocyst , commencing
close to the line of invagination , and extending for some distance backwards .
From this origin they pass transversely inwards , and are inserted into the ...
7 , 8 ) , which arise all round from the inner surface of the endocyst , commencing
close to the line of invagination , and extending for some distance backwards .
From this origin they pass transversely inwards , and are inserted into the ...
Página 27
... to determine how far backwards they extend , as in most cases , the internal
structures soon become concealed under ... straight line , commencing near the
line of invagination , and extending for some distance down the invaginated tunic
.
... to determine how far backwards they extend , as in most cases , the internal
structures soon become concealed under ... straight line , commencing near the
line of invagination , and extending for some distance down the invaginated tunic
.
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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 ..., 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