164 AQUATIC MICROSCOPY FOR BEGINNERS. 



The species are several, being especially common in 

 vegetable infusions. 



20. Chilodon (Fig. T28). 



The body is oval and flattened, the lower or flat 

 ventral surface alone being ciliated. The front border 

 is convex, and rather sharply pointed atone corner, the 

 side of the body extending from this corner to the round- 

 ed posterior margin being nearly straight, while the 

 opposite side is strongly convex. The back is smooth 

 and naked. From the pointed corner a curved line of 

 cilia extends back over the flat surface to the mouth, 

 which opens into a cone-shaped bundle of fine rods 

 visible under a high power. The ends of these rods 

 can be seen with a moderately low power, encircling 

 the mouth like beads. The Infusorium lives upon 

 smaller Infusoria and diatoms, which it seizes by pro- 

 truding this peculiar throat, the rods separating as the 

 food is slowly swallowed. Chilodon is common in still 

 waters. 



21. Lox6des (Fig. I2g). 



The body is long and narrow, the frontal border be- 

 ing convex, with one corner rather acute; but on one 

 side, just below the pointed corner; is a concave space 

 containing a brown, sickle-shaped body lining the 

 hollow which is part of the Infusorium's throat. The 

 upper portion, or blade of the sickle, seems only to 

 stiffen that part of the cavity, the true mouth being at 

 the beginning of the short handle. The cilia are fine, 

 and are on the lower flat surface only. The body is 

 flexible, often bending on itself. The Infusorium is 

 common in some localities. 



