A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
Dentro del libro
Resultados 6-10 de 50
Página 20
... tentacula . The external layer consists of rounded cells filled with a colourless fluid , and often presenting a bright nucleus . Some of those cells which lie upon the back of the tentacle become in certain genera enlarged , giving a ...
... tentacula . The external layer consists of rounded cells filled with a colourless fluid , and often presenting a bright nucleus . Some of those cells which lie upon the back of the tentacle become in certain genera enlarged , giving a ...
Página 21
... tentacula is surrounded at its base by an exceedingly delicate water Phylactolæmata is probably united . In order to understand this relation , it is necessary to conceive of the polypide as partially retracted ; the invaginated portion ...
... tentacula is surrounded at its base by an exceedingly delicate water Phylactolæmata is probably united . In order to understand this relation , it is necessary to conceive of the polypide as partially retracted ; the invaginated portion ...
Página 22
... tentacula , and its margin is in most instances pro- longed more or less upon each tentacle , as a narrow triangular process , so as to present a sort of scalloped or festooned appearance ; the festooning of the margin is most marked in ...
... tentacula , and its margin is in most instances pro- longed more or less upon each tentacle , as a narrow triangular process , so as to present a sort of scalloped or festooned appearance ; the festooning of the margin is most marked in ...
Página 25
... tentacula , each divides into two others , which would appear to run along the opposed sides of two neighbouring tentacula . M. Van Beneden considers them as muscles destined to act on the tentacula ; but it must be admitted that we are ...
... tentacula , each divides into two others , which would appear to run along the opposed sides of two neighbouring tentacula . M. Van Beneden considers them as muscles destined to act on the tentacula ; but it must be admitted that we are ...
Página 29
... tentacula a very short distance , and can exercise no exsertile influence on the inferior portion of the polypide , which , indeed , it must rather tend to repel into the bottom of the cell ; while in all the fresh - water genera , with ...
... tentacula a very short distance , and can exercise no exsertile influence on the inferior portion of the polypide , which , indeed , it must rather tend to repel into the bottom of the cell ; while in all the fresh - water genera , with ...
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