STEUCTURE AND EEPRODUCTION 31 



nuclear fusion. The plastogamic reproduction of 

 Discorhina is shown by Schaudinn to occur as 

 follows. The Hat or inferior faces of the tests are 

 brought together with the apertures coinciding. The 

 w^alls of the last formed chambers are sometimes 

 resorbed, and an enclosing shell made around the 

 space between the tests. Then follows the breaking 

 up of the nuclei, and the formation of embryonic 

 young, which speedily form their own investment 

 to the extent of two or three chambers before 

 breaking away from the enclosing shell. 



