infus6ria. 



159 



Fig. ii8. — Eugl^na. 



It is often absent in an old EugUna. At the posterior 

 end is a short, pointed, stiff, and sometimes curved tail- 

 like prolongation which is usually colorless. The Infu- 

 sorium is conjmon, occasionally 

 occurring in such numbers that it 

 tinges the water green. There 

 is another species, or another 

 variety of this species, whose 

 body is bright crimson. It also is so abundant at 

 times that it colors the water blood-red. The flagel- 

 lum is often lost, a fact which may at first give trouble 

 in the identification of the animal. 



12. Chil<5monas (Fig. iig). 

 This colorless little cjreature is very common in 

 vegetable infusions. It may be recognized by the 





Fig. iig. — Chil6monas. 



Fig. I20. — Fh^cus 

 pIeuron6ctes. 



Fig. 121. — Phdcus 

 longicaiidus'. 



notch at the widest or front end, and the curve of the 

 back which makes it look almost hunch-backed. Un- 

 der a high power it shows two flagella, one of them 

 throwing itself into a coil or loop when the Infusorium 

 settles down to rest, which, by-the-way, it frequently 

 does. The body is filled with small colorless disks 

 which the iodine solution turns blue, showing that 

 they are probably starchy. 



