Cnjptomonadina.] THE INFUSORIA. 113 



in this species, always appears to abide in the samehorizontal 

 position, how quickly soever the creature may be revolving 

 on its longitudinal axis. Figure 30 represents this crea- 

 ture with its proboscis extended ; figure 31, another with it 

 retracted; figure 32 is a very young specimen ; and 33, a 

 full grown one, that has been pressed between two plates of 

 glass, so as to exhibit the lorica broken without destroying 

 any other part, except the red circle above noticed. Found 

 amongst conferva. Size 1 -860th. 



69. Trachelomonas cylindrica. Tlie cylindrical Tra- 

 chelomonas. — Form oblong, approaching to cylindrical ; 

 proboscis almost as long as the body. Colour a beautiful 

 green; eye red; ring purple. Size 1-lOOOth. 



