ioa4 
conspicuous feature of Protococcas fuscalas is lhe colour of the cell-walls. They are of 
a dull dirty brown, and when several cal Is are seen in mass, as at the edge of an Œdogo- 
nium- filament they appear very dark brown or almost black. 
In size P . fuscatus is similar to P. viridis (= Pleurococcus vulgaris auct.; Pleuro- 
cocccus Nàgelii Chodat), but the species is at once dislinguished by its habit and by the 
dull brown cell-walls. 
Wille lias recenlly shown (cfr. Nyt Magazin for Naturvidensk. Christiania, 1913, 
Bd. 5 i) that Protococcas viridis Ac,. must be regarded as lhe correct narae of the common 
Alga so long placed as « Pleurococcus vulgaris ». 
100. Trochiscia reticularis (Reinscii.) Hansg. — Antioquia : n° l\. 
Family Autosporaceæ. 
101. Oocystis elliptica W. and G. S. West. — Cundinamarca : n os i 4 and 23 . 
102. Oocystis parva W. and G. S. West. — Cundinamarca : n° 23 . 
ro 3 . Oocystis natans (Lemm.) Wille. — Cundinamarca : n° 21 (plankton). Long, 
cell. 18 y ; lat. 12 y. 
10 4 . Nephrocytium lunatum W. West. — Cundinamarca: n° 23 . 
10 5 . Eremosphæra viridis De Bary. — Cundinamarca: n° 24. Diam. cell. 142-1 56 y. 
106. Tetraëdron enorme (Ralfs) Hansg. — Antioquia: n os 1 and 2. Diam. cell. 
sine spin. 12-16 y, cum spin. 21-27 y. 
107. Tetraëdron bifurcum (Wille) Lagerh. — Antioquia : n° 4 - Diam. cell. cum 
spin. 29-34 y. 
This species lias a wide distribution in bolh the eastern and western tropics. 
108. Ankistrodesmus falcatus (Corda) Ralfs. — Antioquia : n° 4 - 
Var. acicularis (A. Br.) G. S. West. — Cundinamarca : n u i 4 - 
109. Ankistrodesmus sp. Cellulæ lanceolalæ, 2 vel 4 in tegumento mucoso aggre- 
gatæ, polis acutis ; chromatophora cum pyrenoide singulo. Long. cell. 20-21 y; lat. 
3 , 5 - 4, 3 y. 
Cundinamarca : n° 23 . 
Only two colonies of this Alga were observed. It is probably a new species, but il 
is essential that more specimens should be examinée!. 
1 10. Ankistrodesmus Mayori sp. nov. 
A. minutissimis, inter alias algas libéré nalantibus; cellulis solitariis, angustis, polos 
acutissimos versus gradatim attenuatis, valdissime spiraliter contortis, anfractibus proxis- 
simis duobus ; chromatophora pallide viride, pyrenoidibus nullis. 
Lat. cell. 0, 9-1 , 3 y; diam. anfract. 5 , 6-7 , 5 y; anfract. inter se distantibus 2-2,8 y 
(PI. XXI, fig. 22-23). 
Cundinamarca : Laguna de Ubaque, Eastern Andes ; altit. 2066 m. n° 2,3. 
