Tatem, on New Species of Microscopic Animals. 33 



No distinct oral aperture has been made out. The creature 

 is excessively active in its movements, darting through the 

 water with great velocity, resting or creeping, however, from 

 time to time, on any weed or flocculent matter the cage may 

 contain. 



I have in vain endeavoured to make out the life history of 

 this interesting infusorium. 



On one occasion, in early spring, I met with a little crea- 

 ture, in some numbers, which I believed, though I do not 

 assert it, to be the early form, obtained in the same pools and 

 ditches which, later in the year, abounded with the perfect 

 animal of that which I have ventured to call a Caenomorpha, 

 and to append to it the specific name of convoluta. 



VOL. XVI. 



