On Two New Members of the Volvocaceae. 137 
Hub. In mud and among water-weeds, Stanklin Pool, near 
Kidderminster, Worcestershire (November, 1908—January, 1909). 
All the figures are drawn with the aid of the camera lucida. 
Chlamydomonas, sp. n. (?). 
In collections taken from among Potamogeton lucens, a fair 
number of a species of Chlamydomonas was found. Reference to 
the synopsis of this genus given by Dill, 1 and also by Wille, 2 failed 
to find any species to which this could be referred. The most 
prominent characteristic of the organism was a distinct, well-marked 
channel running up through the transparent “beak” (“hautwatz”). 
It stood out so plainly that there appeared to be a small peg 
projecting from the anterior extremity of the cell (Fig. 13, F). The 
two cilia are not easy to see, even after staining; they arise one on 
either side of the channel in the beak (Fig. 13, F). 
Multiplication was observed in one case. The cell becomes 
large and rounded. The contents round off and divide longitudinally. 
The resulting daughter cells become invested with a cell-wall, but 
are at first of a more rounded form than the older vegetative cells. 
The chloroplast is exceedingly granular, and it is difficult to 
make out pyrenoid or stigma. 
1 Dill. Jahrbxicher fur wiss. Botanik, Heft. 3, Band XXVIII., 
1895. 
2 Wille. Algologische Notizen IX.-XIV., Christiana, 1903. 
University of Birmingham 
Botanical Laboratory. 
February, 1909. 
