EUPLOTES. 13? 



and some the other and this can be seen by the 

 colour in the stomach-cells. 



The last genus I shall mention in the class 

 Polygastrica is Euplotes, a genus with which ob- 

 servers soon become familiar, not only from the 

 beauty of the species, but from the peculiar move- 

 ment of these little creatures. They are of an 

 oval form, very transparent, and brightly coloured 

 with spots of green and red ; they have cilia, 

 and are furnished also with what are called 

 setae, and styles ; these are hair-like appendages 

 variously situated, which, by their quick mo- 

 tions, enable the animalcule to move most rapidly 

 through the water ; they also dart back sud- 

 denly, and, turning round, again advance to the 

 place where they were gaining food : this back- 



N 3 



