120
| Fig. 13. | The same animalcule, seen from downwards; a. cuirass; b. pedal surface; c. c. brown content. |
| Fig.„ 14. | Frustulia agrestis; two united animalcules. Length of an animalcule: 0,00054. |
| Fig.„ 14. | b. The same e. f. standing and distant; c. d. the tubes uniting them. |
| Fig.„ 15. | An animalcule, seen from the pedal surface; c. d. the openings in which the tubes (fig. 14. c. d,) draw themselves back. |
| Fig.„ 15. | b. The same animalcule, seen sidewise; g. h. openings in the cuirass; e. d. openings of the tubes. |
| Fig.„ 16. | Pharyngoglossa sigmoidea; length of the animalcule: 0,002361. a. the stopple of the tube; b. the head; c. the foot of the anus; g. the anus; d. sexual warts. f. f. intestinal tube. |
| Fig.„ 16. | a. Head of the animalcule, seen sidewise, strongly magnified; a. the stopple; b. the fissures of the cuirass with the foot; f. the intestinal tube. |
| Fig.„ 16. | b. Head of the animalcule, seen from downwards; a. the stopple; b. the foot; d. sexual wart; i. brown content. |
| Fig.„ 16. | c. Posterior extremity of the animalcule; c. the foot; g. anus; f. intestinal tube; i. content. |
| Fig.„ 16. | D. Stopple a ², drawn from the opening a ¹ of the alimentary tube f., seen round the ligament b ¹, to which it adheres. |
| Fig.„ 17. | Frustulia viridescens, seen sidewise; a. a. pedal bladders. Length: 0,000185. |
PLATE II.
| Fig.„ 18. | Cosmarium deltoïdes. d. rotatory molecular bladders in the middle; c. c. the same bladders on both sides; e. point of junction of the two animalcules; f. warty cuirass. Size of the double animalcule: 0,000278. |
