Fig. 113. Archegoniurn of Pf^ri-s- at the time of fertilization, ehowiog tissue of gam- 

 etophyte (.-1), the cells forming the neck {B), the pass;ir;e\vay formed by the dis- 

 organization of the canal cells (C), and the egg {B) lying exposed in the venter. 

 —Caldwell. 



Fig. 114. Antheridium of P/etis (B), showing wall cells (a), opening for escape of 

 sperm mother cells (e), escaped mother cells (c), sperms free from mother cells (6), 

 showing spiral and multiciliate character.— Caldwell. 



27 



