448 BOTANICAL GAZETTE [JUNE 
Fic. 9a.—A later stage in the development of a partially imbedded anther- 
idium; the first division of the central cell was evidently the same as under 
normal conditions. 
Fic. 9b.—An early stage in the development of a normal archegonium or 
of an imbedded antheridium; in this case the central cell has apparently given 
_ rise directly to a sperm cell. 
Fic. 10.—The sporogenous cells of an antheridium lying two layers of 
cells beneath the surface of the prothallium. 
Fics. 11, 12.—Two mature imbedded antheridia; both antheridia and 
sperms larger than those developed normally. 
Fic. 13.—A mature, normal antheridium; note position and size as com- 
pared wis those shown in figs. 11 and 12; these three antheridia were all 
taken from the same prothallium. 
Fic. 14—An archegonium normal in all respects except that the basal 
cell is greatly enlarged and contains either an egg or a protoplast which would” 
later have divided to form a second egg and a second ventral canal cell. 
Fic. 15.—An archegonium containing two egg and two ventral canal 
cells; the second egg and canal cells have evidently been derived from the 
