121 



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. 



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 cui- 

 rass, by which is operated the exchange of 

 the molecular streams, f. g. size of the double 

 animalcule: 0,00212. 



21. Cosmarium sinuosiim. 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. 



22. Cosmarium stellinum. A. Maternal animal- 

 cule. B. The offspring Each adult half of 

 the animalcule is provided with 52 points on 

 the cuirass. Size of the double animalcule : 

 0,009545. 



23. Cosmarium truncatum, seen from the sur- 

 face. Size of the double animalcule : from 

 0,003635 to 0,00400. 



24. The same seen from the angle. 



25. Cosmarium Pelta. c. brown content; d. the 

 same already empty. Size 0,00043. 



26. Cosmarium lagenarium. a. a. darker sub- 

 stances in the green content; c. cuirass with 

 a shagreen surface; b. side, joining both ani- 

 malcules. Length: 0,00894; breadth: 0,00328. 



27. Cosmarium Cucumis. a. green content. Length 

 0,00221. 



28. Colpopelta viridis. a. mouth and alimentary 

 tube; b. shagreen -like cuirass; c. green 

 content. Length: 0,00344. 



29. Micrasterias falcata. a. oblique filament, joi- 

 ning both halves of the animalcule. Length 

 of one part of the cuirass : 0,000165. 



