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| Fig. 19. | The same animalcule, both halves separated; c. c. the lateral bladders; d. the middle ones with molecules; a. b. both bladders during the exchange of their molecular streams, in opposite direction. |
| Fig.„ 20. | Cosmarium bipes. Two double animalcules, united at their extremities; b. b. the pedal bladders; c. opening of the mouth; d. the middle molecular bladders; e. e. the lateral bladders; a. opening or fissure of the cuirass, by which is operated the exchange of the molecular streams. f. g. size of the double animalcule: 0,00212. |
| Fig.„ 21. | Cosmarium sinuosum. a. transparent edge of the cuirass; b. green content; c. middle rib; d. d. pedal bladders; e. opening of the mouth. Length of the double animalcule; 0,00075; breadth: 0,00031. |
| Fig.„ 22. | Cosmarium stellinum. A. Maternal animalcule. B. The offspring Each adult half of the animalcule is provided with 52 points on the cuirass. Size of the double animalcule: 0,009545. |
| Fig.„ 23. | Cosmarium truncatum, seen from the surface. Size of the double animalcule: from 0,003635 to 0,00400. |
| Fig.„ 24. | The same seen from the angle. |
| Fig.„ 25. | Cosmarium Pelta. c. brown content: d. the same already empty. Size 0,00043. |
| Fig.„ 26. | Cosmarium lagenarium. a. a. darker substances in the green content; c. cuirass with a shagreen surface; b. side, joining both animalcules. Length: 0,00894; breadth: 0,00328. |
| Fig.„ 27. | Cosmarium Cucumis. a. green content. Length 0,00221. |
| Fig.„ 28. | Colpopelta viridis. a. mouth and alimentary tube; b. shagreen-like cuirass; c. green content. Length: 0,00344. |
| Fig.„ 29. | Micrasterias falcata. a. oblique filament, joining both halves of the animalcule. Length of one part of the cuirass: 0,000165. |
