324 Campbell.—Studies on some East Indian Hepaticae . 
thus formed (Text-fig. 4, F, g). This elongated stalk is unusual among the 
Marchantiaceae, but has been also noted in Targionial 
The apex of the antheridium becomes elongated and forms a con¬ 
spicuous beak (Text-fig. 4 F, G). 
Text-fig. 4. a. Section of tin antheridial receptacle of D. trichocephala. x 35. b-e. 
Young antheridia of D. trichocephala. x 350. F. Ripe antheridium. x 65. g. Antheri¬ 
dium of D. velutina. x 65. 
The development of the spermatozoids was not investigated in detail, 
but the last division of the spermatocytes is not diagonal as Ikeno 1 2 
describes for Marchantia , and the sperm-cells are not so evidently in pairs; 
indeed it looks as if there might perhaps be one less division than is the 
case in Marchantia. The spermatozoids are decidedly larger than in any 
1 McFadden, Effie B.: Bull. Torr. Bot. Club, vol. xxiii, 1896, pp. 242-4. 
2 Ikeno, S. : k Die Spermatogenese von Marchantia polymorpha . Beiheft 3, Bot. Centralbl., 
vol. xv, 1903, pp. 65-88. 
