Frit sch and Takeda. — On a Species of Chlamydomonas . 375 
(Figs. 5, 7, 8, 10, 12). Below this beak lies a V-shaped colourless area, 
indicating the apex of the colourless protoplasmic mass enclosed within the 
central hollow of the massive chloroplast. The flagella are relatively coarse, 
and readily seen both in the living organism and in individuals fixed in 
Chlamydomonas sphagnicola. x 1,000. Figs, i-i 2. Vegetative cells (= zoogonidia). Fig. 13. 
Very early stage in the formation of daughter-cells. Fig. 14. Four mature daughter-cells within 
mother-cell-wall. In Figs. 7-9 and 13 both front and side views are shown. Also in Fig. 14 two 
of the daughter-cells are viewed from front, while the other two are seen from side. Figs. 1-11 and 
13-14 were drawn from fresh material collected at Keston in May, 1915, while Fig. 12 represents 
one of the individuals in the original preparations of Isococcus sphagnicolus collected in the same 
locality in May, 1914. 
osmic acid. They are always longer than the cell, and sometimes reach 
a length of about one and a quarter times that of the body. 
Two contractile vacuoles, which pulsate alternately, have been observed 
at the anterior end of the cell, just below the protoplasmic beak. There is 
a conspicuous stigma, lenticular in shape and somewhat anterior in position 
D d 
