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Fig. 64. Closterium didymotocum. Length: 0,00928. a. mouth; b. rotatory bladder; e. twin globules of the bladder; e. intestinal tube; f. large oily drops surrounding the tube; h. green content; g. union of both parts of the cuirass.
Fig. 65. Extremity of the cuirass, strongly magnified; a. mouth; d. rotatory bladder; e. twin globules; b. direction of their movement.
Fig. 66. Closterium caudatum, strongly magnified.
Fig. 67. Closterium spirale, strongly magnified; b. rotatory globule; d. middle opening; h. intestinal spiral tube (?)
Fig. 68. Pleurosicyos myriopodus. Length: 0,000624. a. sides (8); b. pedal bladders; c. transparent and transversal band.
Fig. 69. Animalcule seen from upwards.
Fig. 70. Scalptrum striatum. Length: from 0,00085 to 0,00096; a. pedal bladders (?); b. middle opening, by which the brown content is emitted; longitudinal stripes between both sides c. of the cuirass.

PLATE VI.

Fig. 71. Oscillatoria subulata. Thickness of the filament: from 0,00039 to 0,000465, strongly magnified; a. maternal filament; b. second filament; c. third filament; d. internodes; e. points.
Fig. 72. The same; a. Maternal tube; the content forms a small head b., pushed forward for the object of creeping.
Fig. 73. 74. Oscillatoria elegans. a. the head, moving in the direction of the arrow, like a pendulum; b. tube of the filament; c. blue greenish content, thickness of the filament: 0,000145.
Fig. 75. Oscillatoria amphibia. Strongly magnified; a. the head; b. division of a filament into two parts; thickness of it: 0,00046; heigth of the members: 0,00014.