A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 20
The tentacula are connected to one another at their base by a membrane which adheres to their back , extending forwards for about one third of their length , and constituting a cup . This membrane passes uninterruptedly from the ...
The tentacula are connected to one another at their base by a membrane which adheres to their back , extending forwards for about one third of their length , and constituting a cup . This membrane passes uninterruptedly from the ...
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 ...
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 ...
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 ...
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 ...
Página 27
The fibres of each fasciculus are inserted one after another in a straight line , commencing near the line of invagination , and extending for some distance down the invaginated tunic . These four lines of insertion are placed at nearly ...
The fibres of each fasciculus are inserted one after another in a straight line , commencing near the line of invagination , and extending for some distance down the invaginated tunic . These four lines of insertion are placed at nearly ...
Página 34
30 ° ) , and then extending along the arms , which at the same time acquire increased proportional length ; the tentacula gradually elongate themselves and acquire cilia . At the same time , the alimentary canal , represented at first ...
30 ° ) , and then extending along the arms , which at the same time acquire increased proportional length ; the tentacula gradually elongate themselves and acquire cilia . At the same time , the alimentary canal , represented at first ...
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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