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 12
... young cell may be seen in various stages of formation . These different stages may be satisfactorily followed , and afford a very interesting example of cytogenetic action . The first thing observed is the accumulation round the nucleus ...
... young cell may be seen in various stages of formation . These different stages may be satisfactorily followed , and afford a very interesting example of cytogenetic action . The first thing observed is the accumulation round the nucleus ...
Página 34
... young polypides , which are suspended from the inner surface of the unciliated portion . 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 ...
... young polypides , which are suspended from the inner surface of the unciliated portion . 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 ...
Página 36
... young cell ( fig . 4 ) . It is the rudimental polypide , and we soon find in it a cavity , which is to become that of the tentacular sheath , within which , when viewed in front , may be seen an oval ring ( fig . 5 ) which is afterwards ...
... young cell ( fig . 4 ) . It is the rudimental polypide , and we soon find in it a cavity , which is to become that of the tentacular sheath , within which , when viewed in front , may be seen an oval ring ( fig . 5 ) which is afterwards ...
Página 37
... 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 ultimately becomes 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 ultimately becomes the ...
Página 38
... young polyzoon already in an advanced stage of development , and in all essential points re- sembling the adult individual in whose cell the statoblasts were produced ( Pl . XI , figs . 42 , 43 ) . The statoblasts have been always ...
... young polyzoon already in an advanced stage of development , and in all essential points re- sembling the adult individual in whose cell the statoblasts were produced ( Pl . XI , figs . 42 , 43 ) . The statoblasts have been always ...
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 crescentic Cristatella Cristatella mucedo d'eau douce described Difflugia disc distinct Dumortier ectocyst Ehrenbergi 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 longitudinal lophophore Lophopus crystallinus margin Mém membrane memoir Meyen mouth Müller Naisa naturalists observed oesophagus 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