108 DROPS OF WATER. 



C. vesiculosimi has a very short foot-stalk, the 

 body bright green, and of an oval form ; currents 

 are seen near the fore part of the body, when 

 coloured particles are introduced into the water, 

 so that there is, probably, a vibratory proboscis. 

 C. stentorinum is more cylindrical in form. 



The genus Distigma is formed of individuals 

 which neither swim nor produce currents, but 

 they creep at the bottom of water, and change 

 their form in a curious manner : they appear 

 to have delicate black eyes. D. tenax is the 

 largest, and it contracts and dilates very visibly ; 

 the colour is yellowish. D. viride has green 

 granules within. Both are found amongst Lemna 

 and Conferva. 



The family Dinofiryonia differs from the last in 



