A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
Dentro del libro
Página 45
... Ascidian and the tentacular crown of the Polyzoon indefensible . Without a knowledge of the Hippocrepian Polyzoa , it would , perhaps , have been im- possible to arrive at anything like a satisfactory conclusion on this point ; the ...
... Ascidian and the tentacular crown of the Polyzoon indefensible . Without a knowledge of the Hippocrepian Polyzoa , it would , perhaps , have been im- possible to arrive at anything like a satisfactory conclusion on this point ; the ...
Página 46
... Ascidian , by a rotation round its oral extremity through an angle of 90 ° in a vertical plane passing through the mouth and anus ; its position from longitudinal will thus be changed to transverse , while the transverse bars will ...
... Ascidian , by a rotation round its oral extremity through an angle of 90 ° in a vertical plane passing through the mouth and anus ; its position from longitudinal will thus be changed to transverse , while the transverse bars will ...
Página 47
... Ascidian is nothing more than a perforated pharynx permeated by a vascular network . In Doliolum , the longitudinal bars actually disappear . In Salpa , both longitudinal and transverse bars have disappeared , and the gill consists ...
... Ascidian is nothing more than a perforated pharynx permeated by a vascular network . In Doliolum , the longitudinal bars actually disappear . In Salpa , both longitudinal and transverse bars have disappeared , and the gill consists ...
Página 49
... ascidian be homologous with the tentacular crown of a Polyzoon , in the sense here maintained , the ganglion in the Polyzoa ought to be situated , not between the œsophagus and rectum , but upon the neural edge of the lophophore . If ...
... ascidian be homologous with the tentacular crown of a Polyzoon , in the sense here maintained , the ganglion in the Polyzoa ought to be situated , not between the œsophagus and rectum , but upon the neural edge of the lophophore . If ...
Página 50
... ascidian , have the thoracic chamber formed on the ascidian type , but in consequence of the non - development of a branchial sac , or of any form of gill , || this chamber is not divided into a branchial and cloacal portion , and has ...
... ascidian , have the thoracic chamber formed on the ascidian type , but in consequence of the non - development of a branchial sac , or of any form of gill , || this chamber is not divided into a branchial and cloacal portion , and has ...
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