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THE MICROSCOPE AND ITS REVELATIONS. 



PLATE XX. 



CAMPANULARIA GELATiNosA. (after Van Beneden). 



A, Upper part of the stem and branches, of the natural size. 



B, Small portion enlarged, showing the structure of the animal; a. terminal branch bearing 

 polypes; 6, polype-bud partially developed; " horny cell containing the expanded polype d; e, 

 ovarian capsule, containing medusiform gemmae in various stages of development;/, flesny sub- 

 stance extending through the stem and branches, and connecting the different polype-cells and 

 ovarian capsules; g, annular constrictions at the base of the branches. 



