76 THE JOURNAL OF BOTANY 
from the mucous coat. The chloroplast is parietal and conforms 
to the shape of the cell ; it is globular-ellipsoid and hollow, having 
at the anterior end a very small excavation immediately under the 
point of insertion of the cilia. The inner surface of the chloro- 
starch grains, but there are no pyrenoids present. The stigma is 
conspicuous and is discoidal with an elliptic outline. It is situ- 
ated in the anterior half of the cell, about one-fourth to one-third 
the length of the — from the anterior end. No contractile 
vacuoles were observed. 
In cultures in rain-water, to which had been added a trace of 
five per cent. nutritive solution, a Glaocystis-like state was 
quickly entered into. The cells divided rapidly, four daughter- 
cells arising within the mother-cell by two oblique longitudinal 
division-planes. In = state of the Alga the mucous coats in 
creased very much in extent. 
HLAMYDOMONAS VARIABILIS Dangeard in ‘ Le Botaniste,” 
6° sér., 1899, p. 147, £17. Chloromonas variabilis (Dang.) Wille. 
Forma aneuica. Long. cell. 10-15-5y; lat. cell. 6-5-9 yp ; long. 
ciliorum 13-17 p. (Fig. 2, A-E.) 
Hab. Near Studley, Warwickshire. 
Fie A-C, normal 
hee: cells. D and EK, tetrads of aerator: Bonn FL ” Chlamydomonas 
ilis. I shows the formation of two daughter.c amydomonas 
elegans. M-O show formation of daughter-cells. ‘AIL x 460 except C, which 
is x 
This organism occurred in abundance in a small pond. It is 
smaller than that originally described by Dangeard, and it also 
differs in a few other particulars, such as the method of division 
of the mother-cell during the formation of a new generation of 
zoogonidia. 
e chee were ellipsoid or pit ees ellipsoid, frequently with 
rather pointed poles, but never cylindrical. The anterior pole was 
invariably slightly protuberant, and in the Vasingty of the insertion 
f the cilia quite colourless. There was also a urless area at 
the posterior pole larger than that at the nasal pole. oe ihe 
