94 DESCRIPTION OF [Polygastrica. 



17. Mo^ AS punc turn. The point egg-shaped Monad. — 

 Revolves on the longitudinal axis of its body. (See 

 eno-raving, group 2 ; the lower figure exhibits one under- 

 going longitudinal division.) Found in water with tannin. 

 Size 1 -1150th. 



B. — Elongated Monads. 

 (a). True Elongated Monads. 



18. MoNAS cylindrica. The cylinder-shaped Monad. — 

 Solitary, colourless, revolves as it progresses. Found in 

 salt water. Size 1-1 150th. 



19. MoNAS Okenii. Okens elongated Monad. — Red, 

 revolving, vibratory motion, social. Found in running 

 water. Size l-2300th. 



{b) . Conical. 



20. MoNAS deses. The lazy Monad. — Green, solitary. 

 Found in water from hills. Size 1 -1200th. 



21. MoNAS socialis. The social Monad. Colourless, 

 social. Found in water-butts. Size 1 -700th. 



(c). Top-shaped. 



22. MoNAS flavicans. The yellow Monad. — Social, 

 gliding motion. Found in ditch-water. Size 1-1 720th. 



{d). Spindle-shaped (*), colourless. 



23. MoNAS simplex. The simjjle spindle Monad. — 

 Ghding and rotatory motion. Found in' water of the Nile, 

 and at Berlin. Size 1-1 720th. 



24. MoNAS inanis. The empty spindle Monad. — 

 Vacillating motion. Found in stagnant and foul water. 

 Size l-3600th. 



25. Mo:s AS scintillans. The sparkling spindle Monad. — 

 Very active. Vacillating motion. Found amongst fresh 

 water conferva, &c. Size 1 -6000th to l-4600th. 



