1899} DEVELOPMENT OF CRYPTOMITRIUM ti7 
in every case the cover cell still remained undivided. The 
stages in which the division had taken place (e, fig. ¢) were too 
old to determine with any degree of accuracy when this division 
occurred, and it is to be regretted that no intermediate stages 
were obtained. 
Gayet,” in a recent article, which has been reviewed by 
Campbell, states that the archegonia of the Hepatice have a 
distinct apical growth, the same as in the Musci. His con- 
clusions, which are contrary to those of Janczewski,’* Campbell, 
and others, are not confirmed by my own observations. While 
I did not make a very careful study of this point, I could find 
nothing that indicated an apical cell. The cover cell, which 
Gayet claims to be the apical cell, does not have the appearance 
of one. It is much smaller than the upper cells of the neck, and 
no way do these cells look as though they had been cut off 
from it. The fact that the cover cell remains undivided for a 
considerable time in this species might favor the idea of apical 
growth, were it not for the fact that the cover cell in this species 
's even smaller than in other species that have been studied 
(4, fig. 4). It looks as if it were lying dormant and not as if it 
Were an active apical cell. 
The usual nu 
Marchantiacese. 
are present, 
mber of neck canal cells is eight, as in the other 
In some cases, however (f, fig. 4), only seven 
THE SPOROPHYTE. 
ae Owing to the fact that the embryo in nearly every case lies 
eS aaa with the stalk, its development has been com- 
Marked re out. One is at once struck with the 
F805 ; id shows to the embryo of Targionia.’* 
its otiginal - ertilization ie egg cell enlarges to nearly twice 
enlarged ii es The first division is transverse and divides the 
: Nay. nto two almost equal cells (a, fig. 5). The next 
aes Sci. Nat. Bot. VIII. —:——. 1897. 
Se 8: 428-431. 1897. 
I: loc. cit, 
— SAMPBELL - %P. cit. 60, 61. 1895, 
