552 Williams . — The Anther ozoids of 
to the dense protoplasm ; sometimes it lies in the centre of 
the concavity, either resting upon the surface of the layer 
or imbedded in its substance, and even occasionally projecting 
beyond the general surface of the head. In some cases, 
however, it lies away from the dense layer altogether. 
The flagellum arises from about the centre of the disk of 
denser protoplasm. In a few exceptional cases it seems to 
be attached to the edge ; but this is probably due to the first 
coil of the spiral flagellum lying close to the head so as to 
be partly covered by it (Fig. 3). 
Some of the antherozoids were fixed when the motion was 
becoming sluggish. When these were stained it was found 
that the flagellum in each case was more or less closely coiled 
round the head. Some typical examples are shown in Fig. 4. 
This naturally suggests that the reason for the difficulty of 
seeing the flagellum in antherozoids which are not motile is, 
that it is closely coiled round the head. The same fact may 
account for the apparently greater amount of deeply staining 
protoplasm in the contents of the antheridial cells than in 
the head of the swarming antherozoid. 
The same phenomena were observed in male plants of 
Taonia atom aria, J. A g., collected at Llandudno, but in this 
case no permanent preparations were made. 
I beg to express my thanks to the Council of the Royal 
College of Science for allowing me the use of a free table 
in the Botanical Laboratory, and to Professor Farmer for 
valuable assistance and advice. I am also indebted to 
Professor Phillips and the Council of the University College 
of North Wales for the privilege of using the Botanical 
Laboratory while collecting material in the Menai Straits. 
Royal College of Science, London, 
Sept. 30, 1897. 
