PLATE 7 



EXPLANATION OF FIGURES 



54 One half of a section through a very young polygerm showing formation 

 of the primary masses. X 1040. 



55 Median section of a young polygerm. X 626. 



56 Median section of an almost completed polygerm, showing the youngest 

 stage at which an asexual embryo can be recognized (As.E.). X 626. 



57 A completed polygerm with an asexual embryo at the upper end. X 626. 



58 A later stage with an asexual embryo at the lower end. X 626. 



59 Median section of a completed polygerm. X 626. 



60 Transverse section of a polygerm showing a primary mass undergoing 

 division (on the left). X 626. 



61 Detailed drawing showing the completed division of a primary mass. 

 X 1167. 



58 



