B 



FIG. 63. Pandorina morum. 



A. The entire colony, consisting of sixteen flagellate zooids, enclosed 

 in a gelatinous envelope. 



B. Asexual reproduction ; each zooid has divided into sixteen, forming 

 as many daughter families, still enclosed within the original gelatinous 

 envelope. 



c. Sexual reproduction ; zooids are being set free from the colony, 

 forming gametes. 



D. Conjugation of two gametes. 



E. The same after complete fusion. 



F. The immature zygote. 



G. The fully-formed zygote. 



H. Protoplasm of zygote escaping from cell-wall. 

 I. The same after acquisition of flagella. 



K. The same undergoing division and forming a young colony. 

 (From Goebel. ) 



