A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
Dentro del libro
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Página 3
... bodies , each characterised by the possession of an elegant crown of tentacula borne on the margin of a crescent - shaped disc . This beautiful tentacular plume is one of its most striking features ; and as Trembley naturally supposed ...
... bodies , each characterised by the possession of an elegant crown of tentacula borne on the margin of a crescent - shaped disc . This beautiful tentacular plume is one of its most striking features ; and as Trembley naturally supposed ...
Página 11
... of protrusion and retraction is very imperfect , and is here limited to such change of position as is connected with a slight extension and flexion of the oesophagus . consist almost entirely of bodies exactly resembling the nuclei of 11.
... of protrusion and retraction is very imperfect , and is here limited to such change of position as is connected with a slight extension and flexion of the oesophagus . consist almost entirely of bodies exactly resembling the nuclei of 11.
Página 12
... bodies exactly resembling the nuclei of the cells ; some of these intercellular nuclei contain two nucleoli , and seem to be undergoing division , while round others a young cell may be seen in various stages of formation . These ...
... bodies exactly resembling the nuclei of the cells ; some of these intercellular nuclei contain two nucleoli , and seem to be undergoing division , while round others a young cell may be seen in various stages of formation . These ...
Página 13
... bodies in a tubular network in the substance of the endocyst is a fact of great interest . It is nearly certain that whatever may have been the origin of the corpuscles , they found the tubes already existing for their reception . It ...
... bodies in a tubular network in the substance of the endocyst is a fact of great interest . It is nearly certain that whatever may have been the origin of the corpuscles , they found the tubes already existing for their reception . It ...
Página 18
... bodies may be observed to be whirled along in the vortices caused by the action of the tentacular cilia , and conveyed to the mouth , where many of them are at once seized and swallowed , and others rejected . The food having once ...
... bodies may be observed to be whirled along in the vortices caused by the action of the tentacular cilia , and conveyed to the mouth , where many of them are at once seized and swallowed , and others rejected . The food having once ...
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