_g_, A spherical coenobium or jelly-colony; _a_, large alveoles, forming a cortical zone; _c_, central capsules; _k_, oil-globules. Fig. 7. _Collozoum vermiforme_, n. sp., × 100 27 _c_, A single isolated central capsule; _x_, xanthellæ surrounding this central capsule; _k_, oil-globules; _n_, nuclei. Fig. 8. _Collozoum ellipsoides_, n. sp., × 2 26 A spherical colony; the red points are central capsules. Fig. 9. _Collozoum ellipsoides_, n. sp., × 150 26 _c_, A single isolated central capsule; _k_, oil-globules; _n_, nuclei. Fig. 10. _Collozoum inerme_, Hkl., × 2 25 An old, cylindrical, articulated coenobium; the red points are centralcapsules. Fig. 11. _Collozoum inerme_, Hkl., × 2 25 A young cylindrical coenobium; the red points are central capsules. Fig. 12. _Collozoum inerme_, Hkl., × 400 25 A piece of a young colony with eight small central capsules, without oil-globules. _n_, The central nucleus in different stages of division. Two capsules are also dividing. _x_, Xanthellæ in the jelly-like calymma (blue), which also contains numerous vacuoles. [Illustration: COLLOZOUM.] PLATE 4. LEGION SPUMELLARIA. Orders BELOIDEA. Families Sphærozoida. Fig. 1. _Sphærozoum trigeminum_, n. sp., × 50 43 An annular colony. The main mass of the jelly-colony is filled up by large alveoles; the entire surface is densely covered with spicula, and beyond this skeleton-cover lie the spherical central capsules, each with an oil-globule. This species is by mistake not mentioned in the text. Fig. 2. _Sphærozoum alveolatum_, n. sp., × 50 43 Section through a spherical colony; displaying the inside of a hemisphere. All the central capsules lie in a single stratum on the surface of the jelly-sphere, each being surrounded by a thick-walled alveole. The spicula lie between the alveole and the capsule, which includes a central oil-globule. Fig. 3. _Sphærozoum alveolatum_, n. sp., × 400 43 A single central capsule, filled up by crystal-spores. Numerous geminato-radiate spicula and spherical xanthellæ lie between the capsule and the including thick-walled alveole. In the jelly-calymma, between the capsule and the alveole, numerous thin ramified pseudopodia are expanded. Fig. 4. _Sphærozoum geminatum_, n. sp., × 400 45 A single central capsule, with a central oil-globule, surrounded by numerous spicula and spherical xanthellæ. The jelly-substance of the calymma is expanded between the points of the spicula.