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 23
... genus Laguncula . It is possible that certain apertures may exist in some of the tissues of the animal so minute as to defy our attempts at detection , and yet capable of permitting a passage of fluid ; some facts already recorded ...
... genus Laguncula . It is possible that certain apertures may exist in some of the tissues of the animal so minute as to defy our attempts at detection , and yet capable of permitting a passage of fluid ; some facts already recorded ...
Página 27
... genus Lophopus , they seem to be present throughout the whole endocyst . By their action they evidently constrict the endocyst in a transverse direction , and thus aid in the protrusion of the polypide . A muscular tissue is also very ...
... genus Lophopus , they seem to be present throughout the whole endocyst . By their action they evidently constrict the endocyst in a transverse direction , and thus aid in the protrusion of the polypide . A muscular tissue is also very ...
Página 32
... genus , are simple vibrioid bodies ( fig . 23 ) without any terminal enlargement . They present distinct though somewhat sluggish undulatory motions . The distal portion of the testis is more developed than the portion which lies nearer ...
... genus , are simple vibrioid bodies ( fig . 23 ) without any terminal enlargement . They present distinct though somewhat sluggish undulatory motions . The distal portion of the testis is more developed than the portion which lies nearer ...
Página 33
... genus . The testicle was coexistent with the ovary , and was loaded with spermatozoa , multitudes of which projected from its surface , presenting quite the same appearance as in Alcyonella , while many had escaped from the testicle ...
... genus . The testicle was coexistent with the ovary , and was loaded with spermatozoa , multitudes of which projected from its surface , presenting quite the same appearance as in Alcyonella , while many had escaped from the testicle ...
Página 39
... genus Cristatella . I have sought in vain , in all the fresh - water Polyzoa , for some orifice through which the statoblasts or ova may escape from the cells ; and yet , from the large size and incompressible nature of the former ...
... genus Cristatella . I have sought in vain , in all the fresh - water Polyzoa , for some orifice through which the statoblasts or ova may escape from the cells ; and yet , from the large size and incompressible nature of the former ...
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