152 CONJUGATION, MATURATION, AND FERTILIZATION 



marked sexual dimorphism, the manifestations of maturity showing in 

 greatly reduced size and relatively great kinetic energy on the one 

 part, and increased nutritive potential and relative sluggishness on 

 the other. For purposes of description these various conditions are 

 usually grouped under the headings isogamy (fusion of equal gametes) 

 and anisogamy (fusion of dissimilar gametes). 



a a 



" s 



5 A 



-i 



o ta 



* 



-ni 



d .^T 

 



(H O 



-! 



O a 



