103 



ORGANS OF MOTION. 



Their movement is performed by very simple 

 organs , when in possession of them , or with the 

 whole body. 



In describing the cuirass and the coat of these 

 animalcules, I spoke of the feet passing through the 

 holes of the cuirass, and of those which are formed 

 by the elongation and extension of the coat. These 

 feet are easily observed in the Frustuliae and Navi- 

 culae of larger species. The Pharyngoglossa syg- 

 mo'idea has, above the mouth, a longitudinal fissure 

 (fig. 16.1).), through which the pedal bladder comes 

 out (fig. 16. b. b. b.). A similar bladder is observed 

 in the posterior part of the body, and at the end of 

 the intestinal tube (fig. 16. c.). 



In the Frusiulia viridescens (fig. 17.) larger 

 vesicular feet (b) are easily seen. In the Scalptrum 

 (fig. 70.) they are seen (b.) near the extremities of 

 the body upon the angles, where the middle opening 

 is found. 



In the Pleurosicyos myriopodus (fig. 68) we see 

 several hundreds of such feet (b.)$ the animalcule 

 being octangular, and each side having 18 20 such 

 feet, consequently upon both sides 40 feet: 40 X 

 8 zzz 320 are the total number of the animal's feet. 



In the Oscillatoriae, the Closteria and several other 

 genera, I never was able to discover these feet. 



