A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and Foreign |
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Página 12
consist almost entirely of bodies exactly resembling the nuclei of the cells ; some of these intercellular nuclei contain two nucleoli , and seem to be undergoing division , while round others a young cell may be seen in various stages ...
consist almost entirely of bodies exactly resembling the nuclei of the cells ; some of these intercellular nuclei contain two nucleoli , and seem to be undergoing division , while round others a young cell may be seen in various stages ...
Página 34
The arms of the lophophore in the young polypides are at first but slightly developed , and there is as yet no trace of tentacula ( Pl . XI , fig . 30o ) ; these soon present themselves in the form of minute tubercles , at first ...
The arms of the lophophore in the young polypides are at first but slightly developed , and there is as yet no trace of tentacula ( Pl . XI , fig . 30o ) ; these soon present themselves in the form of minute tubercles , at first ...
Página 36
We next perceive that a portion of the lining tunic , near the wide extremity of the gemma , projects in the form of a roundish mass into the interior of the young cell ( fig . 4 ) . It is the rudimental polypide , and we soon find in ...
We next perceive that a portion of the lining tunic , near the wide extremity of the gemma , projects in the form of a roundish mass into the interior of the young cell ( fig . 4 ) . It is the rudimental polypide , and we soon find in ...
Página 37
By this time the young polypide has become removed from the surface of the endocyst of the parent cell , to which it is now only connected by a membranous sac which suspends it in the perigastric space of the adult , and which ...
By this time the young polypide has become removed from the surface of the endocyst of the parent cell , to which it is now only connected by a membranous sac which suspends it in the perigastric space of the adult , and which ...
Página 38
When the statoblasts are placed under circumstances favouring their development , they open by the separation from one another of the two faces , and there then escapes from them a young polyzoon already in an advanced ...
When the statoblasts are placed under circumstances favouring their development , they open by the separation from one another of the two faces , and there then escapes from them a young polyzoon already in an advanced ...
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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 |