WHEEL ANIMALCULES. 307 



The particular species of Wheel-bearer. whose mouth is here 

 shown is called scientifically Limnias ceratophylli. It derives 

 the latter name from the fact that it is mostly found on the 

 submerged stems and leaves of the Horn wort (Ceratophyllum), 

 which is very common in ponds and slow streams. The 

 creature is, however, to be found on the water- growing plants, 

 and Mr. Grosse, in his "Evenings with the Microscope," gives a 

 very full and graphic account of itself and its habits. 



He specially mentions the use of the wheels, and, by 

 dissolving a little carmine in the water, had the pleasure of 

 seeing the coloured granules swept into the mouth by the 

 current caused by the cilia through the jaws, and so into the 

 stomach. 



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