38 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



spores, which finally burst out into the water or other medium 

 in which the animal lives, where each spore develops into an 

 organism like the parent. This process makes it possible for 

 the animals to multiply very rapidly, and we shall see something 

 of its importance when we come to study the Sporozoa, a group 

 of parasitic Protozoa which all reproduce in this way and some 

 of which are the causes of certain common diseases of man and 

 other animals. 



