. Methods of study in natural history . Animals; Corals; Embryology. ALTERNATE GENEEATIONS. 251 like disk, with a proboscis hanging from the lower side, which, to complete the comparison, we may call the handle of the umbrella. The margin of the disk is even more deeply lobed than in the Hydroid condition, and in the middle of each lobe is a second depression, quite deep and narrow, at. Ephyra or Aurelia flavidula. the base of which is an eye. How far such organs are gifted with the power of vision we cannot de- cide ; but the cells of which they are composed certainly serve the purpose of fac
. Methods of study in natural history . Animals; Corals; Embryology. ALTERNATE GENEEATIONS. 251 like disk, with a proboscis hanging from the lower side, which, to complete the comparison, we may call the handle of the umbrella. The margin of the disk is even more deeply lobed than in the Hydroid condition, and in the middle of each lobe is a second depression, quite deep and narrow, at. Ephyra or Aurelia flavidula. the base of which is an eye. How far such organs are gifted with the power of vision we cannot de- cide ; but the cells of which they are composed certainly serve the purpose of facets, of lenses and prisms, and must convey to the animal a more or less distinct perception of light and color. The lobes are eight in number, as before, with a tube diverging from the centre of the body into each lobe. Shorter tubes between the lobes alter- nate with these, making thus sixteen radiating tubes,' all ramifying more or less. From this stage to its adult condition, the animal undergoes a succession of changes in the gradual course of its growth, uninterrupted, however, by any such abrupt transition as that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agassiz, Louis, 1807-1873. Boston : Ticknor and Fields
Size: 1614px × 1548px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookd, booksubjectanimals, booksubjectembryology
