The microscope and its revelations . ly affords an investment to the stem, but formscups or cells for the protection of the polypes, as well ascapsules for that of the reproductive bodies. In the (E, the polype-cells are campanulate or beU-shaped, andare borne at the extremities of ringed stalks (Eig. 223, c); inthe Sertularidce, on the other hand, the polype-ceUs He alongthe stem and branches, attached either to one side only, or toboth sides (Eig. 224). In both, the general structure of the in-dividual polypes (Fig. 223, d) closely corresponds with that ofthe Hydra; and the mod
The microscope and its revelations . ly affords an investment to the stem, but formscups or cells for the protection of the polypes, as well ascapsules for that of the reproductive bodies. In the (E, the polype-cells are campanulate or beU-shaped, andare borne at the extremities of ringed stalks (Eig. 223, c); inthe Sertularidce, on the other hand, the polype-ceUs He alongthe stem and branches, attached either to one side only, or toboth sides (Eig. 224). In both, the general structure of the in-dividual polypes (Fig. 223, d) closely corresponds with that ofthe Hydra; and the mode in which they obtain their food isessentially the same. Of the products of digestion, however, aportion finds its way down into the tubular stem, for the nou-rishment of the general fabric; and very much the same kindof circulatory movement can be seen iu Campanularia, as inTubularia, the circulation being most vigorous in the neigh-bourhood of growing parts. It is from the soft flesh (/) COMPOSITE HTDEOZOA :—CAMPAXriAEIDiE. 537. Campanularia gelatvnosa:—A, upper part of the stem and branches,of the natural size; b, a small portion enlarged, showing the structnreof the animal; a, terminal branch bearing polypes; h, polype-budpartially developed; c, homy cell, containing the expanded polype d;e, ovarian capsule, containing medusifoi-m gemmas m. various stagesof development; /, fleshy substance extending through the stem andbranches, and connecting the different polype-cells and ovarian cap-sules; a, annular constrictions at the base of the branches. 538 ZOOPHYTES. contained in the stem and branches, that new polype-buds (b)are evolved; these carry before them (so to speak) a portionof the horny integument, which at first completely invests thebud; but as the latter acquires the organisation of a polype,the case thins-away at its most prominent part, and an openingis formed, through which the young polype protrudes origin of the bodies commonly but erroneously de
Size: 1158px × 2158px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
