402 
Mottier. — Notothylas . 
Fig. 23. Longitudinal section of an archegonium of Anthoceros', the wall 
between egg-cell and ventral canal-cell has disappeared ; the rounded contents of 
these two cells are surrounded by gelatinous substance, a condition almost in- 
variably present when the organ is ready to open, x 520. 
Fig. 24. Similar to Fig. 23, but with high projecting cap-cells, x 520. 
Figs. 25-27. Longitudinal vertical sections representing three early stages in the 
development of the antheridium of Anthoceros. In Fig. 25 may be seen two 
antheridium-mother-cells formed by longitudinal division of a primary cell, x 520. 
Figs. 26 and 27, x 372. 
