A Monograph of the Fresh-water Polyzoa: Including All the Known Species, Both British and ForeignRay Society, 1856 - 119 páginas |
Dentro del libro
Página 20
... Cristatella . The internal layer is a delicate transparent membrane , in which I could detect no trace of approximated at their extremities , and thus , instead of constituting an open crescent , they form a ring enclosing a space which ...
... Cristatella . The internal layer is a delicate transparent membrane , in which I could detect no trace of approximated at their extremities , and thus , instead of constituting an open crescent , they form a ring enclosing a space which ...
Página 21
... Cristatella , a minute cavity , which looks as if it were cut off from the rest of the tube , may be very plainly seen in the extremity of each . tentacle ; this condition would also seem to exist in other genera , but it is nowhere so ...
... Cristatella , a minute cavity , which looks as if it were cut off from the rest of the tube , may be very plainly seen in the extremity of each . tentacle ; this condition would also seem to exist in other genera , but it is nowhere so ...
Página 22
... Cristatella . It is curious enough that the calyx should be exactly coincident with the presence of an epistome in all the fresh - water Polyzoa ; unless Urnatella should prove to be an exception , which is not likely , though we are ...
... Cristatella . It is curious enough that the calyx should be exactly coincident with the presence of an epistome in all the fresh - water Polyzoa ; unless Urnatella should prove to be an exception , which is not likely , though we are ...
Página 31
... Cristatella , Lophopus , and other genera with crescentic lophophores , the ganglion may be seen giving off from each side a rather thick chord ( Pl . II , fig . 24 , a ) which immediately enters the tubular arms of the lophophore , and ...
... Cristatella , Lophopus , and other genera with crescentic lophophores , the ganglion may be seen giving off from each side a rather thick chord ( Pl . II , fig . 24 , a ) which immediately enters the tubular arms of the lophophore , and ...
Página 35
... Cristatella the gemmæ are produced very regularly from constant points on the sides of the previously existing cells , and the new cells thus produced remaining in apposition with one another , and never becom- ing extended into ...
... Cristatella the gemmæ are produced very regularly from constant points on the sides of the previously existing cells , and the new cells thus produced remaining in apposition with one another , and never becom- ing extended into ...
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