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 13
... seen to have been developed in the endocyst throughout its whole extent . They were not scattered at random through this membrane , but were contained in the interior of a system of tubes which formed a network in the substance of the ...
... seen to have been developed in the endocyst throughout its whole extent . They were not scattered at random through this membrane , but were contained in the interior of a system of tubes which formed a network in the substance of the ...
Página 16
... seen in Alcyonella a gizzard with an organization precisely similar to that of Bowerbankia . * The stomach is a large thick - walled sac , and may be divided into two portions , first a nearly cylindrical prolongation ( Pl . V , fig . 5 ...
... seen in Alcyonella a gizzard with an organization precisely similar to that of Bowerbankia . * The stomach is a large thick - walled sac , and may be divided into two portions , first a nearly cylindrical prolongation ( Pl . V , fig . 5 ...
Página 17
... seen surrounding the stomach , and are probably muscular fibres ; they are particularly evident in Alcyonella and Plumatella towards the fundus of the stomach ; they become less distinct as we ascend toward the œsophagus , and totally 3 ...
... seen surrounding the stomach , and are probably muscular fibres ; they are particularly evident in Alcyonella and Plumatella towards the fundus of the stomach ; they become less distinct as we ascend toward the œsophagus , and totally 3 ...
Página 20
... seen , however , that the position of the anus though within the circle of tentacula is still properly external to the lophophore , and thus really occupies its normal position in the concavity of the crescent . The membranous cup which ...
... seen , however , that the position of the anus though within the circle of tentacula is still properly external to the lophophore , and thus really occupies its normal position in the concavity of the crescent . The membranous cup which ...
Página 21
... seen in the extremity of each . tentacle ; this condition would also seem to exist in other genera , but it is nowhere so well marked as in Cristatella . In all the fresh - water genera , with the exception of Paludicella , and possibly ...
... seen in the extremity of each . tentacle ; this condition would also seem to exist in other genera , but it is nowhere so well marked as in Cristatella . In all the fresh - water genera , with the exception of Paludicella , and possibly ...
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