6 yS Blackman.—The Primitive Algae 
with the other cytological characters, to hold right through 
from the typical Flagellate Chloramoeba to these high fila¬ 
mentous Algae. 
Luther proposes to regard these forms as evolved from the 
Chloromonadina of the Flagellates and to take them therefore 
right out of the true Chlorophyceae which are regarded as 
evolved from the Protomastigina group of the Flagellates, and 
to make a separate main group of them equivalent with that 
of Chlorophyceae. For this he proposes the name of Hetero- 
kontae, and divides it up into a Flagellate group Chloromona- 
dales with the ascending series of forms Chloramoeba , BohL, 
Vacuolaria, Cienk., Chlorosaccus , Luther, and an algal series 
Confervales , Bz.'containing the families Confervaceae, Chloro- 
theciaceae and Botrydiaceae. 
The evidence for this separation seems adequate, and it is 
an immense advance in the direction of a natural phylogenetic 
classification of the green Algae. Possibly other series of 
forms may also be removed from the Chlorophyceae and 
have an independent evolution attributed to them, thus ren- 
dering.the Algae still more polyphyletic. 
The relation between the green Algae and the Flagellates 
may be briefly summarized thus. The green Euglenoidina 
give rise to no algal forms, the green Chloromonadina have 
given rise to the Heterokontae series of green Algae, while 
the colourless Protomastigina have probably produced the 
Chlamydomonad type and all that has arisen from it. 
In conclusion I propose to give a short account of the relation 
between the brown Flagellates and some of the newly de¬ 
scribed forms of the Phaeophyceae. 
Section V. Primitive Phaeophyceae . 
Not many years ago (see Kjellman (’ 91 ) in Engler and 
Prantl) the simplest structural forms recognized amongst the 
Phaeophyceae were elaborately branched filaments such as 
occur in the marine Ectocarpus and the fresh-water Pleurocladia\ 
Klebahn (’ 95 ), Wille (’ 95 ). 
