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 34
... separation from the walls similar to that just described . The embryo is still contained within the external membrane of the ovum , which , however , has become much distended , in accordance with the increasing size of the included ...
... separation from the walls similar to that just described . The embryo is still contained within the external membrane of the ovum , which , however , has become much distended , in accordance with the increasing size of the included ...
Página 38
... separation from one another of the two faces , and there then escapes from them a young polyzoon already in an advanced stage of development , and in all essential points re- sembling the adult individual in whose cell the statoblasts ...
... separation from one another of the two faces , and there then escapes from them a young polyzoon already in an advanced stage of development , and in all essential points re- sembling the adult individual in whose cell the statoblasts ...
Página 39
... separated faces of the statoblast continue for some time to adhere to the posterior end of the young polyzoon , like the valves of a bivalve shell . In Cristatella the essential stages of the development of the statoblast are similar to ...
... separated faces of the statoblast continue for some time to adhere to the posterior end of the young polyzoon , like the valves of a bivalve shell . In Cristatella the essential stages of the development of the statoblast are similar to ...
Página 41
... separating the entire colony into two or more smaller ones . It may , perhaps , be thought that I ought to have ... separation of the buds in masses . It is analogous to the gemmiparous reproduction of Hydra , and must not be confounded ...
... separating the entire colony into two or more smaller ones . It may , perhaps , be thought that I ought to have ... separation of the buds in masses . It is analogous to the gemmiparous reproduction of Hydra , and must not be confounded ...
Página 43
... separation of the Polyzoa from the Polypes , that the molluscan relations of the Polyzoa began at last to be recognised in an obvious resemblance between their organization and that of the Ascidea . Guided by this relation , an ...
... separation of the Polyzoa from the Polypes , that the molluscan relations of the Polyzoa began at last to be recognised in an obvious resemblance between their organization and that of the Ascidea . Guided by this relation , an ...
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