A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 44
It must , moreover , be borne in mind , that the transverse bars open into two great longitudinal canals , the " branchial " and " thoracic sinuses of Milne - Edwards , one placed upon the neural , and the other upon the hæmal side of ...
It must , moreover , be borne in mind , that the transverse bars open into two great longitudinal canals , the " branchial " and " thoracic sinuses of Milne - Edwards , one placed upon the neural , and the other upon the hæmal side of ...
Página 45
Now it does not need much assistance from the imagination to see in the great branchial sinus of Clavelina , a representative of the lophophore of Plumatella , while the transverse bars which pass off at either side from this sinus ...
Now it does not need much assistance from the imagination to see in the great branchial sinus of Clavelina , a representative of the lophophore of Plumatella , while the transverse bars which pass off at either side from this sinus ...
Página 46
This correspondence will be rendered more obvious by imagining the branchial sinus to be depressed towards the neural side of the Ascidian , by a rotation round its oral extremity through an angle of 90 ° in a vertical plane passing ...
This correspondence will be rendered more obvious by imagining the branchial sinus to be depressed towards the neural side of the Ascidian , by a rotation round its oral extremity through an angle of 90 ° in a vertical plane passing ...
Página 47
Now nearly all the changes which we have thus hypothetically supposed to take place in Clavelina , in order to convert its branchial sac into the tentacular crown of Plumatella , do actually occur in other genera of Tunicata , some in ...
Now nearly all the changes which we have thus hypothetically supposed to take place in Clavelina , in order to convert its branchial sac into the tentacular crown of Plumatella , do actually occur in other genera of Tunicata , some in ...
Página 48
The main tube , with its lateral pinnæ , thus constitutes an imperfect diaphragm , which divides the great thoracic chamber into an anterior or branchial portion , and a posterior or cloacal portion . Now the main tube may be obviously ...
The main tube , with its lateral pinnæ , thus constitutes an imperfect diaphragm , which divides the great thoracic chamber into an anterior or branchial portion , and a posterior or cloacal portion . Now the main tube may be obviously ...
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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