124 DESCRIPTION OF [PoTygastrica. 



MowAS enchehjs. The flash-shaped Blonad. — Contiatious bIow 

 motion. Found in marsh water. Size l-1200tli to l-960tli. 



M. nmlra. The shadow Monad. — Rapid motion. Fotind among 

 fresli conferva?. Size 1 -2400th. 



M. hijalina. The diaphanous Monad. — Active, and seems to leap 

 or jump. Found in stale water in glass vessels. Size 1 -6000th to 

 l-2880th. 



M. gliscens. The gliding Monad — Gliding motion. Foimd in 

 ■watery infasions of the stinging nettle. Size l-4500th. 



M. oralis. The little Egg-shaped Monad. — Tremulous motion. 

 Found in water of the Anodonta Mollusca. Size 1 -9600th. 



M. mica. The glittering Monad. — Eotatory and vacillatiag motion. 

 Inhabits clear fresh water. Size l-1440th to l-1200th. 



M. punctum. The point egg-shaped Monad. — Revolves on the 

 longitudinal axis of its body. (See engi'aving, group 2 ; the lower 

 figure exliibits one imdergoing longitudinal division.) Found in 

 water with tannin. Size 1-11 50th. 



B. — ^Elongated Mojs^ads. — {a). True Elongated Monads. 



M. cylindrica. The cylinder-shaped Monad. — Solitary, colourless, 

 revolves as it progresses. Found in salt water. Size 1-11 50th. 



M. Okenii. Okens elongated Monad. — Red, revolving, vibratory 

 motion, social. Found in rimuing water. Size l-2300th. 



(J)). Conical. 



M. deses. The lazy Monad. — Green, solitary. Found in water 

 from laills. Size l-1200th. 



M. socialis. The social Monad. Colourless, social. Found in 

 water-butts. Size 1 -700th. 



((?). Top-shaped. 



M. flavirans. The yellow Monad. — Social, gliding motion. Found 

 in ditch-water. Size 1-1 720th. 



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



M. simplex. The simple spindle Monad. — Gliding and rotary motion. 

 Found in water of the ISile, and at Berlin. Size 1-1 720th. 



M. inanis. The empty spindle Monad. Vacillating motion. Found 

 in stagnant and foul water. Size l-3G00th. 



