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 40
... ovary occur elsewhere in the same individual , are quite decisive against their being eggs . We must then look upon them as gemmæ peculiarly encysted and distined to remain for a period in a quiescent or pupa - like state . It was for ...
... ovary occur elsewhere in the same individual , are quite decisive against their being eggs . We must then look upon them as gemmæ peculiarly encysted and distined to remain for a period in a quiescent or pupa - like state . It was for ...
Página 41
... ovary as true ova ; but admits at the same time that they are possibly agamic . The external resemblance of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but , with the very different origin of the two sets ...
... ovary as true ova ; but admits at the same time that they are possibly agamic . The external resemblance of these ephippia with the statoblasts of the Polyzoa is singularly striking ; but , with the very different origin of the two sets ...
Página 42
... ovary be attended to , it will be seen that this body is developed at a late period from the walls of the original sac - like embryo , which have under- gone slight changes , and have become the endocyst of the more mature Polyzoon ...
... ovary be attended to , it will be seen that this body is developed at a late period from the walls of the original sac - like embryo , which have under- gone slight changes , and have become the endocyst of the more mature Polyzoon ...
Página 64
... ovary ; and he has examined the external form of the statoblasts , which he con- siders to be eggs , and the structure of their investing capsule , with more detail than any pre- vious observer . But the most singular feature in the ...
... ovary ; and he has examined the external form of the statoblasts , which he con- siders to be eggs , and the structure of their investing capsule , with more detail than any pre- vious observer . But the most singular feature in the ...
Página
... External layer of esophagus . μ2 . External layer of rectum . Ε . Spermatozoa . 4. Gemma . x . Testis . . Ovary . DESCRIPTION OF THE PLATES . Fig . PLATE I. CRISTATELLA The following Letters apply in all the Plates where they ...
... External layer of esophagus . μ2 . External layer of rectum . Ε . Spermatozoa . 4. Gemma . x . Testis . . Ovary . DESCRIPTION OF THE PLATES . Fig . PLATE I. CRISTATELLA The following Letters apply in all the Plates where they ...
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
adherent Alcyonella Alcyonella fungosa Alcyonella stagnorum alimentary canal Allman anatomy animal annulus Ascidian attached become Beneden Bowerbankia Brachiopoda branches branchial sac Brit Brux campanulata cavity cell cilia cœnocium crescentic Cristatella Cristatella mucedo d'eau douce described Difflugia disc distinct Dumortier ectocyst embryo endocyst epistome exserted external fibres flabellum fluid fresh-water Polyzoa funiculus ganglion genera genus Gervais hæmal Hancock hippocrepian Hist homologous intestine invaginated l'Acad Lamarck layer Leidy Linnæus lophophore Lophopus crystallinus margin Mém membrane memoir Meyen mouth Müller Naisa naturalists observed œsophagus organ orifice Original figures ovary ovum Paludicella parieto-vaginal muscles peculiar Pedicellina perigastric space Plumatella repens Polype à Panache polypide Polyzoon portion posterior present Raspail respiratory retraction retractor retractor muscles Rösel seen septa side species specimens statoblasts stomach structure surface tentacles tentacula tentacular crown tentacular sheath thoracic chamber transparent transverse Trembley tubes Tubularia repens tunic Tunicata Urnatella walls Zooph Zoophytes