436 The Botanical Gazette. [October, 
at the tip of the filament on each of which is inserted an an- 
theridium. The same process may be repeated until as many 
as eight superposed oogonia terminate the fertile hypha. In 
M. insignis, however, oogonia frequently occur in connection 
with which no antheridium has been formed. In &%. fascicu- 
their escape in a quite characteristic fashion, each drawing 
out its successor from the antheridium by means of its cilium, 
but this seems certainly not to be the case, the exit being ac- 
complished by means of amoeboid movements, each anthero- 
zoid escaping independently of those which have gone be- 
The free swimming antherozoids are nearly spherical or 
broadly oval in form, with a few refractive granules and a 
large central nucleus. They move with considerable rapid- 
ity, the cilium being directed backwards, and may often be 
seen to come suddenly to rest on an unfertilized oogonium 
over which they begin at once to creep with an amoeboid 
motion. 
When the antheridium has become partially emptied, the 
escaping antherozoids do not all swim off in the surrounding 
