138 DROPS OF WATER. 



ward and forward motion is frequently repeated, 

 and occasions them to be easily recognized. 

 They make a powerful current with the cilia 

 near the mouth. Euplotes char on (Drop III. 

 fig. 9) is, I think, the most common, and is 

 found in infusions. E. patella is larger, more 

 round in form, and abounds most where duck- 

 weed is growing. There are several species of 

 this interesting genus found in sea-water. 



