Genera. 
Classification of Green Algce . 
23 
1 . Pohjblepharides. Dangeard, 1887 . 
Body conical with broad end anterior, Flagella 6 - 8 . 
2 . Pyramimonas. Schmarda. 
Body conical 4 -lobed. Chromatopliore 8 -lobed. 
Flagella 4 , inserted between the lobes. 
3 . Chloraster Ehrenberg. 
Body with 4 contractile lobes. Flagella 5 . 
4 . Tetratoma. Biitschh. 
Body spherical or ovoid. Flagella 4 inserted 
separately. 
II. Chlamj domonadese. 
Body unicellular usually spherical or oval, rarely spindle- 
shaped with a distinct cell-wall . Flagella typically two (rarely 
four). Chromatopliore typically basin-shaped enveloping the 
colourless peri-nuclear protoplasm. Pyrenoid typically one , in 
the posterior part of the chromatopliore. Eye-spot usually present, 
lateral. 
Reproduction by successive divisions in planes at right angles 
to one another, the first usually transverse, the cell nearly always 
coming to rest before the beginning of division, giving rise to 
2 , 4 or 8 daughter cells, which rapidly acquire the characters of 
the motile individual. Planogametes similar to the vegetative 
individuals but smaller and usually naked, produced in the same 
way, but up to 64 in a cell. Clothed anisoplanogametes found in 
some species, the entire contents of megagamete acting as an 
egg. Akinetes and palmelloid stages are also sometimes formed 
from the vegetative individuals. 
Genera. 
1 . Carteria. Diesing, 1868 . 
Body variable in shape mostly with a very thin cell-wall. 
Flagella 4 . First division-plane longitudinal. 
2 . Chlatnydornonas. Ehrenberg, 1832 . 
Body spherical or oval with a thin closely adherent 
cell-wall. Flagella 2 . Chromatophore typically basin- 
sliaped with a single pyrenoid, sometimes reticulate or 
banded. First division-plane longitudinal, longitu¬ 
dinal rotating to the transverse position, or transverse. 
Conjugation of naked isogametes or clothed iso- or 
anisogametes, the last shewing true oogamy 
(C\ Braunii). 
[This genus holds a unique position among the Green Algre, and 
indeed among the whole of the Green Plants. It may be regarded as 
the phylogenetic starting point of the various lines of Chlorophyceous 
