Some Problems of Reproduction: a Comparative Study of ...

34 MARCTTS M. HAETOG.
in the great transformation it undergoes. There can be no
doubt that the " inner cell " of the male antheridium is a true
gametogonium, since all its brood-cells become functional
gametes; and as the " inner cell" of the archegonium is the
homologue of that of the antheridium, we have here an additional
reason for regarding the former as a gametogonium,
and the neck canal-cells as the outcome of degraded gametes;
for we must remember that these are of a lower generation than
the belly canal-cell and oosphere.
2. Vascular Cryptogams.
In VASCULAR CKYPTOGAMS generally the antheridium resembles
that of Muscinese inessentials; but the archegonium
is somewhat different, for the initial cell only forms the neckwall
and inner cell, the belly-wall being formed by a sort of
epithelial wall segmented off the adjacent cells of the prothallus. 1
Moreover, the divisions of the inner cell are often symme-
< ': i XN ->
Ni (central cell). j / N ! (belly-canal cell).
j\N 2 (oosphere).
W (neck-canal cell);