A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 11
Under the action of acetic acid each is distinctly seen to be bounded by a double outline , and to contain a large nucleus with nucleolus ( Pl . II , fig . 9 ) ; the nucleus , with its nucleolus , are imbedded in the walls of the cell .
Under the action of acetic acid each is distinctly seen to be bounded by a double outline , and to contain a large nucleus with nucleolus ( Pl . II , fig . 9 ) ; the nucleus , with its nucleolus , are imbedded in the walls of the cell .
Página 12
These different stages may be satisfactorily followed , and afford a very interesting example of cytogenetic action . The first thing observed is the accumulation round the nucleus of a little mass of granular protoplasm .
These different stages may be satisfactorily followed , and afford a very interesting example of cytogenetic action . The first thing observed is the accumulation round the nucleus of a little mass of granular protoplasm .
Página 13
14 ) , which under the action of acetic acid dilates and fills nearly the entire corpuscle ( fig . 15 ) . The situation of these bodies in a tubular network in the substance of the endocyst is a fact of great interest .
14 ) , which under the action of acetic acid dilates and fills nearly the entire corpuscle ( fig . 15 ) . The situation of these bodies in a tubular network in the substance of the endocyst is a fact of great interest .
Página 18
... and , during the process of digestion , we may perceive that the peculiar peristaltic action of the walls is more marked in it than in any other part of the gastric cavity , while it is every now and then separated from the rest of ...
... and , during the process of digestion , we may perceive that the peculiar peristaltic action of the walls is more marked in it than in any other part of the gastric cavity , while it is every now and then separated from the rest of ...
Página 21
... action of a well - developed sphincter muscle , the tentacular crown being at the same time slightly drawn backwards by some retractor fibres , which may be seen extending from the upper part of the pharynx to the base of the cell .
... action of a well - developed sphincter muscle , the tentacular crown being at the same time slightly drawn backwards by some retractor fibres , which may be seen extending from the upper part of the pharynx to the base of the cell .
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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
Información bibliográfica
| Título | A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign Volumen18 de ¬The Ray Society |
| Autor | George James Allman |
| Editor | Ray Society, 1856 |
| Procedencia del original | la Biblioteca Estatal de Baviera |
| Digitalizado | 13 Nov. 2009 |
| Largo | 119 páginas |
| Exportar cita | BiBTeX EndNote RefMan |