OF ANIMALCULES. 99 



mer cluster, and the animalcule swims about, increasing 

 in width till it finally extends itself to four pillows. 

 Another method of propagation is by cross divisions, 

 forming the mass into squares, like the Gonium pulvi- 

 natum. An indication of a transverse division is shewn 

 in the figure by the light line along the middle. 



The motion of this species is slow, and it often re- 

 mains quiescent for some time after it has been disturbed. 

 Their method of locomotion is best observed without co- 

 vering them with mica or glass. They are very small, 

 and require a deep magnifier to examine them. I em- 

 ployed a power of 500 times. The breadth of the cluster 

 drawn in figure 96 was 1-1 100th of an inch : hence the 

 diameter of each pillow must be about l-4400th of an 

 inch. Found in June among healthy confervag in clear 

 water. 



168. GoNiUM corrugatum. The wrinkled Gonium is 

 found in various infusions, and especially in those of 

 fruit, as the pulp of the pear. It is very minute, and 

 slightly depressed at one end -, streaks may also be dis- 

 cerned along the body. Figure 98 represents two spe- 

 cimens magnified. 



169. GoNiUM truncatum, vel ohtusangulum. The trun- 

 cated Gonium. — This animalcule is much larger than the 

 former ; it is flat, and of a triangular form, as shewn in 

 figure 94. Found in clear water. Scarce. 



J 70. Go^ WMrectangulum. The square-angled Gonium. 

 — This species only differs from the preceding one in its 

 greater length, and in having the lower corner a right 



