326 Campbell.—Studies on some East Indian Hepaticae. 
periclinal divisions in the mature archegonium. The number of neck canal- 
cells was not determined with certainty, but is probably six or eight. 
The neck of the archegonium in D. trichocephala is strongly bent 
upward when mature, this being probably the result of the position of the 
Text-fig. 5. a. Section of young carpocephalum of D. trichocephala. x 35. b. Similar 
section of D. velutina . x 35. C, D. Young archegonia of D. trichocephala . x 560. F. An 
older archegonium. x 480. g. Ripe archegonium. x 100. H. Archegonia of D. velutina. 
x 95. 
archegonia, which are pushed completely to the lower side of the receptacle 
by excessive growth of the dorsal tissue (Text-fig. 5, G). In D. velutina , 
where the receptacle is much less convex, the archegonia lie almost horizon¬ 
tally, and the neck is nearly straight (Text-fig. 5, B, h). 
No perianth or other envelope is formed about the archegonia. 
Rhizoids and irregular narrow scales are developed upon the ventral 
