123 



Fig. 39. Fragilaria undulata. Length: 0,000125 chain 

 formed with three animalcules; a. a. two 

 intestinal tubes 5 b. the foot; c. d. transversal 

 tubes coming from each alimentary tube, so 

 far as the edge c; e. cellular interval with 

 a colored content. 



40. The same animalcule, seen sidewise. 

 41. Diatoma Navicula. Length: 0,00104; breadth: 

 0,00025. a. orifices of a common alimentary 

 tube ; brown or green content of each cel- 

 lular animalcule; b. a drop of oil. 

 42. The same animalcule, seen from the surface 



of reunion. 



43. Desmidium didymum. Heigth of a member: 



0,00055; breadth: 0,00199. Magnified chain 



of animalcules; a. intestinal tube; b. cuirass; 



c. flake uniting two animalcules. 



44. Animalcule seen from the uniting surface; 



a. tube ; b. cuirass. 



45. Syrinx annulatum. Length: 0,00165; a. b. 

 intestine tubes; c. cuirass; d. brown content; 

 e. annular folds of the cuirass. 

 46. The same animalcule, seen from the uniting 



surface, a. h. intestinal tube. 



47. Paradesmus foliolum. Chain of three animal- 

 cules; a. brown flake of the content; b. sur- 

 face uniting two animalcules. Breadth of a 

 member: 0,000255; length: 0,000540. 

 48. Scenedesmus ellipticus. 0,0040. Four united 



animalcules, not distant. 

 49. The same, distant; a. the animalcules; b. 



muscular flake of reunion. 



50. Scenedesmus caudatus ; a. b. three animal- 

 cules near one another; d. the fourth distant; 

 c. flake of reunion; e. pedal hairs. Length 

 of a member: 0,00047. 



51. Meridian cor datum. Circular chain of ani- 

 malcules; length of a member: 0,0095. 

 52. Separated animalcule; b. brown content. 

 53, Scenedesmus pyrus: 0,000355. 



