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 7
... ciliated tentacula , and to have a single nervous ganglion situated on one side of the oesophagus . Let us now suppose this canal to be bent back upon itself towards the side of the ganglion so as to approximate the termination to the ...
... ciliated tentacula , and to have a single nervous ganglion situated on one side of the oesophagus . Let us now suppose this canal to be bent back upon itself towards the side of the ganglion so as to approximate the termination to the ...
Página 16
... cilia , while those which look towards the vent are thin , membranous , and transparent , and destitute of cilia . It may be observed , when the polypide is exserted from its cell , to be in a constant motion , which consists in an ...
... cilia , while those which look towards the vent are thin , membranous , and transparent , and destitute of cilia . It may be observed , when the polypide is exserted from its cell , to be in a constant motion , which consists in an ...
Página 18
... cilia , but I could detect no appearance of cilia further than a short distance down this tube . The structure of the intestine closely resembles that of the œsophagus ; vibratile cilia however , are altogether absent . In Cristatella ...
... cilia , but I could detect no appearance of cilia further than a short distance down this tube . The structure of the intestine closely resembles that of the œsophagus ; vibratile cilia however , are altogether absent . In Cristatella ...
Página 19
... cilia . I have had an oppor* The structure of Pedicellina has been hitherto entirely misunderstood . tunity of carefully examining this Polyzoon , and as it is constructed on a plan quite peculiar , and may tend to throw light on the ...
... cilia . I have had an oppor* The structure of Pedicellina has been hitherto entirely misunderstood . tunity of carefully examining this Polyzoon , and as it is constructed on a plan quite peculiar , and may tend to throw light on the ...
Página 20
... cilia , arranged in a single series , and vibrating towards the remote extremity of the tentacle upon one side , and towards the base on the other . Two very distinct layers ( Pl . IX , fig . 5 ) enter into the structure of the ...
... cilia , arranged in a single series , and vibrating towards the remote extremity of the tentacle upon one side , and towards the base on the other . Two very distinct layers ( Pl . IX , fig . 5 ) enter into the structure of 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