120 



Fig. 13. The same animalcule, seen from downwards 5 



a. cuirass 5 b. pedal surface 5 c. c. brown 



content. 

 14. Frustulia agrestis ; two united animalcules. 



Length of an animalcule: 0,00054. 

 14. b. The same e. f. standing and distant 5 c. d. 



the tubes uniting them. 

 15. An animalcule, seen from the pedal surface; 



c. d. the openings in which the tubes (fig. 



14. c. d,) draw themselves back. 

 w 15. b. The same animalcule, seen sidewise; g. h. 



openings in the cuirass 5 c. d. openings of 



the tubes. 

 16. Phuryngoglossa sigmo'idea ; 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. 

 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. 



16. b. Head of the animalcule, seen from down- 

 wards ; a. the stopple; b. the foot; d. sexual 



wart; i. brown content. 

 16. c. Posterior extremity of the animalcule; c. 



the foot; g. anus; f. intestinal tube; i. content. 

 16. D. Stopple a 2 , drawn from the opening a 1 



of the alimentary tube f. , seen round the 



ligament b % to which it adheres. 

 17. Frustulia viridescens , seen sidewise; a. a. 



pedal bladders. Length: 0,000185. 



1 ! A T K II. 



18. Cosmarium delto'ides. d. rotatory molecular 

 bladders in the middle; c. c. the same blad- 

 ders on both sides; e. point of junction of 

 the two animalcules; f. warty cuirass. Size 

 of the double animalcule: 0,000278. 



