64 PLATE XXIX. 



F I G. ILL 

 V^O RTICELLA V I R I D I S. 



GENERIC CHARACTER. 



A worm capable of contracting or extending itfelf, naked, with 

 rotatory cilia. 



SPECIFIC CHARACTER. 



Cylindrical uniform, green, and opake. Miiller's Anim. Infuf* 



The naked eye difcovers this fpecies as a mere point : when magnif- 

 ied it is of a dark green colour, almoft opake, nearly cylindrical, 

 obtufe at the extremities, and deftitute of limbs. It moves circularly, 

 or in a ftrait direction, and caufes fuch an agitation of the water, that 

 notwithstanding its appearance, fome rotatory inftrument muft be con- 

 cealed within the body, which the infect can put forth at pleafure. 



PLATE 



