. Seaside studies in natural history. Marine animals. share in the function of feeding the community, so that a diges- tive apparatus would be quite superfluous for them. In every other respect they are perfect Medusae, attached to the Hydra as the Medusa buds always are when first formed, having the (four) chymiferous tubes, characteristic of all Hydroid Medusae, radi- ating from the centre to the periphery; two of these tubes are very winding, as may be seen in Pig. 110, while the other pair are straight. The Medusae themselves are heart-shaped La form, depressed, at the centre of the upper
. Seaside studies in natural history. Marine animals. share in the function of feeding the community, so that a diges- tive apparatus would be quite superfluous for them. In every other respect they are perfect Medusae, attached to the Hydra as the Medusa buds always are when first formed, having the (four) chymiferous tubes, characteristic of all Hydroid Medusae, radi- ating from the centre to the periphery; two of these tubes are very winding, as may be seen in Pig. 110, while the other pair are straight. The Medusae themselves are heart-shaped La form, depressed, at the centre of the upper surface, and bulging on- either side into wing-Kke expansions, where they join the stem. These expansions interlock with one another, crossing nearly at right angles. The Medusae-like buds are the swimming bells; by their contractions, alternately taking in and throwing out the water, they impel the whole community for- ward, so that it seems rather to move like one animal, than like a combination of individuals. Fig. 109. YouDg Nanomia, older than Tig. 108. Fig. 110. Heart-Bliaped swimming bell of Nanomia ; 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, Elizabeth Cabot Cary, 1822-1907; Agassiz, Alexander, 1835-1910, joint author. Boston, J. R. Osgood and Company
Size: 1694px × 1475px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectmarineanimals, bookye
