12 
Transactions of the Royal Society of South Africa. 
which are, however, often isodianietric as in the typical P. integrum, and a 
tendency towards rounding off of the angles. 
Other features of West's diagnosis do not hold good. Thus, the colonies 
are by no means always elliptical in outline (c/, Fig. 3, a, e, and /i), and the 
number of component cells is subject to very considerable variation, as a 
reference to the figures will show ; colonies consisting of 15 cells have not, 
however, been observed, and this is perhaps an abnormal condition. The 
following numbers and arrangements of the cells were encountered : 6 (5-1), 
8 (6-2), 16 (10-6, 11-5, 10-5-1, 9-6-1) ; colonies with still more numerous 
cells, not uncommonly arranged in two layers, are not infrequent (Fig. 3, d). 
The type of colony, shown in Fig. 3,/, is probably to be regarded as a 
young stage. It differs from the others in the smaller size of its cells, and 
in the fact that the outer edge of the marginal cells, between the two 
processes, is usually markedly retuse. Slight indications of this retuse 
character are at times to be found even in the large-celled colonies. It is 
noticeable that in this small-celled form the processes have attained their 
full dimensions. 
(5) CHLORELLACEAE. 
Genus TEOCHISCIA Kuetzing. 
1. Trochiscia stag7ialis, Hansgirg, Prodr. d. Algenfl. v. Boehmen, ii, 1892, 
p. 241. (Syn. : Acanthococcus palustris, Hansgirg, op. cit., i, 1888, p. 274.) 
Sample 340 (very rare). 
Genus TETEAEDEON Kuetzing. 
1. Tetraeclron minimum (A. Br.), Hansgirg, Ueb. d. Suesswasseralg.-Gatt. 
Trochiscia, etc., Hedwigia, xxvii, 1888, p. 131. (Syn. : Polyedrium minimum, 
A. Br.) 
Sample 71. 
Previously recorded from the Karoo and Little Namaqualand (G. S. 
West). 
(6) OOCYSTACEAE. 
Genus OOCYSTIS Naegeli. 
1. Oocystis solitaria, Wittrock, in Wittr. et Nordst., Alg. exsicc, No. 
244, Bot. Notiser, 1879, p. 27 ; Printz, IJebers. ueb. d. Gatt. Oocystis, Nyt 
Mag. f. Naturvidenskab., li, 1913, p. 183, Tab. V, figs. 36-39. 
Sample 36. 
Long, cell., 23-25 fi ; lat., 12-16 /x. 
Previously recorded from Cape Colony and Orange Free State (Fritsch). 
