Fig. 2. _Thalassoplancta brevispicula_, n. sp. (vel _Lampoxanthium brevispiculum_), × 120 36 The central capsule contains numerous clear vacuoles, and in the cortical zone a layer of large oil-globules. The central nucleus includes numerous dark nucleoli. The calymma is alveolate. The spicula lie only in the cortical zone. Fig. 3. _Thalassoxanthium cervicorne_, n. sp., × 300 33 The central capsule is filled up by clear vacuoles and contains a large central nucleus, with a single nucleolus. The spicula surround the thin calymma. Fig. 4. _Thalassoxanthium cervicorne_, n. sp., × 600 33 A single spiculum. Fig. 5. _Thalassoxanthium medusinum_, n. sp., × 120 32 The central capsule is filled up by clear vacuoles and contains on its cortical zone a layer of large oil-globules. The central nucleus contains numerous dark nucleoli. The calymma is radially striped, contains numerous small xanthellæ, and is surrounded by the spicula. Fig. 6. _Thalassoxanthium octoceras_, n. sp., × 400 34 Three isolated spicula. [Illustration: LAMPOXANTHIUM.] PLATE 3. LEGION SPUMELLARIA. Order COLLOIDEA. Family COLLOZOIDA. Fig. 1. _Collozoum serpentinum_, n sp (vel _Collophidium serpentinum_, Hkl), × 10 26 A living coenobium, with expanded pseudopodia. The spherical calymma (or the common jelly-mass of the colony) is alveolate and contains numerous cylindrical, serpentine, central capsules. Numerous yellow cells or xanthellæ are scattered between the radial pseudopodia in the periphery. Fig. 2. _Collozoum serpentinum_, n. sp., × 50 26 An isolated, cylindrical, worm-shaped, central capsule, with an axial series of oil-globules; the red points are nuclei. Fig. 3. _Collozoum serpentinum_, n. sp., × 150 26 An isolated, cylindrical, serpentine, central capsule. _k_, Oil-globules forming an axial series; _n_, densely placed, red-coloured nuclei;, _c_, the capsule membrane under which are scattered small black pigment spots in the colourless cortical zone of the endoplasm; _a_, extracapsular alveoles; _x_, xanthellæ or "yellow cells." Fig. 4. _Collozoum amoeboides_, n. sp., × 100 28 A spherical coenobium or jelly-colony. Each amoeboid central capsule contains an oil-globule; the small red points are nuclei. Fig. 5. _Collozoum amoeboides_, n. sp., × 400 28 _c_, A single isolated central capsule; _n_, nuclei; _k_, oil-globule. Fig. 6. _Collozoum vermiforme_, n. sp., × 30 27