ONTOGENESIS 



133 



justment of the original tissues, some of which 

 become modified to wholly different uses to what 

 they served before. 



FIG. 48. Vegetative reproduction (terminal budding) in an Annelid 

 worm, Myrianida: A, an asexual individual which has produced by 

 budding from a zone (z) a chain of twenty-nine zooids, the oldest being 

 labelled /, the youngest 29; B, a ripe male zooid ; C, a ripe female 

 zooid. (Malaquin.) 



In Myrianida, another worm of the same class, 

 the divisions follow each other so rapidly that one 



