English Soils : an Important Factor in Soil Biology. 73 
ovoid eae, 13-16 /a longae, 9*5-11 \i latae, ciliis binis circa i^-plo longioribus 
praeditae ; stigmatibus a vel 3, disciform ibus, varie dispositis. Chloro- 
phorum ampullaceum in lobos pulviniformes intus projectum, nonnunquam 
perforatum, 11 no magno pyrenoide media parte instructum. 
Propagatio fit divisione cellularum matricalium, altera obliqua altera 
transversa, in 4 zoogonidia. 
Hab. in solo culto, Sedgley (Staffs.). 
Text-fig. 11 . 1-7, Chlamydomonas communis. Snow ; 1-3, motile vegetative cells ; 4, rest- 
ing cell in which division is about to take place ; 5 and 6, longitudinal fission into four zoogonidia ; 
7, oblique fission ; c., chloroplast ; py , pyrenoid ; d.py., dividing pyrenoid ; s., pigment-spot ; 0., oil 
globules ; 8-14, Chlamydomonas pluristigma, n. sp. ; 8 and 9, motile cells with three pigment-spots ; 
10, ditto with two pigment-spots and perforated chloroplast ; 11, resting cell with two pigment 
spots ; 12, oblique fission of cell into two, followed by 13, transverse fission into four ; 14, transverse 
fission of cell, x Circ. 1430. 
3. Coccomyxa Solorinae, Chod., forma. 
In seven of the soil-samples a species of Coccomyxa appeared which 
agreed more clearly with C. Solorinae than with any other described species, 
but which differed from it in the relative length and breadth of the cells. 
The cells were oval with rounded or more rarely pointed ends, 6 to 7 ft long 
by 3 to 3*5 ft, broad, and contained a single parietal chloroplast but no 
pyrenoid. The division of the cell took place at first in an almost transverse 
plane, but this later became oblique, and the daughter-cells were liberated 
by the dissolution of the mother-cell wall to form a thin mucilaginous 
