45 



becomes the pedicel, and the upper the arche- 

 gonium. 



(4) The pedicel cell undergoes numerous trans- 

 verse and longitudinal divisions, so that a mul- 

 ticellular stalk is produced. 



(5) The mother cell of the archegonium produces 

 three longitudinal walls, by which three outer 

 cells are formed and one inner. 



(6; The three outer walls divide up by longitu- 

 dinal radial walls, so as to form six outer 

 investing cells. 



(7) The median cell divides by a tran.^verse wall 

 into an upper and a lower cell, the upper is 

 called the neck canal cell, and the lower the 

 ventral cell. 



(8) Each of the six outer investing cells divides 

 into two by a transverse wall, and so two tiers 

 of cells are formed, the lower tier becomes the 

 ventral pertion and the upper the 7iec]c. 



(9) The internal cell of the ventral portion— the 

 ventral cell — increases considerably in size and 

 is divided by a transverse septiim into a large 

 inferior cell, the oosphere or ovum, and a small 

 upper cell — the ventral canal cell. 



(10) Meanwhile the upper tier of cells elongates, 

 and the neck canal cell divides into four, eight, 

 or sixteen long narrow cells, these are the canal 

 cells of the neck. 



