482 Microscopical Essays. 



When very much magnified, this animalculum feems to have 

 fome relation to the vorticella facialis, as feen with the naked eye. 

 It confifts of cryflalline molecules, difpofed in a fphere, and 

 filling up the whole circumference ; they are all of an equal fize. 

 Whether they are included in a common membrane, or whether 

 they are united by one common ftalk, as in the vorticella facialis, 

 has not been difcovered. We are alfo ignorant of the exacl; 

 figure of the little particles of which it is compofed ; when a very 

 large magnifying power is ufed, fome black points may be dis- 

 cerned in the center of the cryftalline molecules. The motion is 

 fometimes rotatory, fometimes from right to left, and the con- 

 trary. It is found where the chara vulgaris has been kept. 



tg. Volvox Sphsericula. 



Volvox fphaericus, moleculis fimilaribus rotundis. Spherical 

 volvox, with round molecules. 



This fpherule is formed of pellucid homogeneous points, of dif- 

 ferent fizes. It moves {lowly about a quarter of a circle from 

 l ight to left, and then back again from left to right. 



20. Volvox Lunula. 



Volvox hemifphaericus, moleculis fimilaribus lunatis. An 

 hemifpherical volvox, with lunular molecules. Fig. 7, Plate 

 XXV. 



Is 



