A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
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Página 11
... 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 . 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 . The ...
Página 12
... action . The first thing observed is the accumulation round the nucleus of a little mass of granular protoplasm . In the midst of this a minute vacuola next shows itself ; this becomes the cell - cavity , and gradually increases in size ...
... action . The first thing observed is the accumulation round the nucleus of a little mass of granular protoplasm . In the midst of this a minute vacuola next shows itself ; this becomes the cell - cavity , and gradually increases in size ...
Página 13
... 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 . It is nearly certain that whatever may ...
... 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 . It is nearly certain that whatever may ...
Página 18
... 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 this cavity by a momentary hour - glass constriction . In the œsophagus there are only two ...
... 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 this cavity by a momentary hour - glass constriction . In the œsophagus there are only two ...
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 . The ...
... 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 . The ...
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