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 10
... Fredericella , whose relations with the species furnished with a crescentic lophophore are of the most intimate kind . Hippocrepianism , therefore , though of great interest as a morphological fact , tending , as will be afterwards ...
... Fredericella , whose relations with the species furnished with a crescentic lophophore are of the most intimate kind . Hippocrepianism , therefore , though of great interest as a morphological fact , tending , as will be afterwards ...
Página 13
... Fredericella a slightly prominent keel is also apparent , but the notch - like transparent space does not here exist . In Cristatella ( Pl . I ) the ectocyst would seem to be entirely absent ; and this genus . therefore , presents the ...
... Fredericella a slightly prominent keel is also apparent , but the notch - like transparent space does not here exist . In Cristatella ( Pl . I ) the ectocyst would seem to be entirely absent ; and this genus . therefore , presents the ...
Página 15
... Fredericella sultana , imperfect septa may here and there be observed , while Cristatella and Lophopus would seem to be quite deprived of them , the cells in these genera all opening into one another . The ectocyst of the fresh - water ...
... Fredericella sultana , imperfect septa may here and there be observed , while Cristatella and Lophopus would seem to be quite deprived of them , the cells in these genera all opening into one another . The ectocyst of the fresh - water ...
Página 19
... Fredericella the arms of the crescent are obsolete , and the lophophore here may , on a superficial view , appear orbicular ; but a careful examination will render manifest its departure from the orbicular form , the side corresponding ...
... Fredericella the arms of the crescent are obsolete , and the lophophore here may , on a superficial view , appear orbicular ; but a careful examination will render manifest its departure from the orbicular form , the side corresponding ...
Página 22
... Fredericella ; in some species of Plumatella it is scarcely perceptible . A high power of the microscope , and carefully adjusted illumination , will enable us to detect in the calyciform membrane certain delicate anastomosing lines ...
... Fredericella ; in some species of Plumatella it is scarcely perceptible . A high power of the microscope , and carefully adjusted illumination , will enable us to detect in the calyciform membrane certain delicate anastomosing lines ...
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