oe MARCUS M. HARTOG. 
2. Characee. 
In CuHarace# the spermatozoa are biflagellate; they are 
formed by the direct evolution of the cell-bodies of short dis- 
coid segments of long confervoid filaments; these grow by 
intercalar divisions, which, perhaps, may be taken to corre- 
spond with the ordinary gametogenic fissions of a spermatogo- 
nium. The oosphere is formed by the enlargement of the 
terminal member of ashort file of cells. The cutting off of one 
or three sterile basal cells (“‘ Wendungszellen’”’?) by oblique 
septa suggests the formation of one functional and one or three 
arrested gametes by one or two divisions of a gametogonium. 
D. ARCHEGONIATA. 
This group is distinguished by the formation of the arche- 
gonium, a cellular flask-shaped structure, withasingle oosphere 
occupying its belly, and a series of canal-cells its neck; the 
latter degenerate to attract and bring in the spermatozoon. 
1. Muscinee. 
In the Muscine# one single “initial cell” by its divisions 
forms the archegonium. The earliest divisions separate off 
the tissue-cells destined to form the wall and stalk of the 
archegonium from the “inuer cell,” which gives rise to the 
oosphere and canal-cells. This inner cell divides according to 
the accompanying schema (Fig. 2); at its bipartition are 
N3) 
oxy 
| N3 
(N ’ N &c., neck canal-cells. 
Ley 
N N3 
{ NZ 2623. S52 belly canal-cell. 
N} 
INesacgens te oosphere. 
Fig. 2.—Schema of divisions of inner cell of archegonium in Muscinee. 
formed two cells, a basal ‘‘ central cell”? and an apical ‘“ neck 
