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 Naviculae of larger species. The Pharyngoglossa sygmoïdea has, above the mouth, a longitudinal fissure (fig. 16. b.), 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 Frustulia 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 = 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.
