Volvocina.] THE infusoria. 129 



Fi(/. 57 represents a single animalcule, separated from 

 its lorica, and magnified 2000 diameters. Found in 

 shallow pools of clear water, in spring and summer, at 

 Hampstead. 



The largest globes measure l-30th of an inch in dia- 

 meter; the smallest free swimming ones l-360th to 

 1 -240th. Size of a single animalcule, l-3500th. 



87. VoLvox aureus. The golden Volvox. — These 

 animalcules are of a green colour, and nearly globular. 

 The large clusters are in the form of a sphere, and the 

 smaller ones within them of a golden colour, and smooth 

 surface. Found in rain water standing on turf. Diameter 

 of globe l-36th. 



88. Volvox stellatus. The starry Volvoos. — These 

 animalcules are small, of an angular form, and green 

 colour. The clusters are subglobose, sometimes oblong, 

 and contain other globes within them, of a green colour, 

 and having their surfaces tuberculated or stellated. 

 Diameter of globe l-30th. 



