CYCADALES 



145 



cilia that pass through the outer border of the sperm and project 

 for some distance. 



It has been claimed that the two cells formed by the division of 

 the body cell become ciliated and are themselves the sperms. Ikeno 



Figs. 170-172. — Sperms of cycads, represented as not formed within mother 

 cells, but as consisting of the entire transformed halves of body cells: fig. 170, Zamia; 

 pollen tube with sperms just before they begin to swim; X90; fig. 171, Cycas revoluta; 

 the sperms at the beginning of movement; fig. 172, Cycas revoluta: the sperms swim- 

 ming freely in the tube; X88. — Fig. 170, after Webber (32); figs. 171, 172, after 



MiY.AKE (48). 



(27) described the sperms of Cycas as perfectly naked, and Webber 

 (32) found the same condition in Zamia, where he was unable to 

 find any inclosing mother cell, although he looked for it. Miy.a.ke 

 (48) also looked for an inclosing cell in Cycas and saw a thin mem- 



