22 
Transactions of the Boyal Society of South Africa. 
which there is also a slight convergence of the sides which are not parallel, 
as in the typical var. crassum. These specimens seems to link up vars. 
crassum and tnmidum. 
Genus CLOSTEEIUM Nitzsch. 
1. Closteritim pegleri, F. E. Eritsch, n. sp. (Fig. 6, B). 
C. submediocre ; cellulis singulis vel saepe in fasciculos e cellulis 
numerosis compositos consociatis, semilunaribus, lanceolatis, medio paullo 
Fig. 6. — A, Closterium ehrenhergii, Menegh., var. concavum, Schmidle, forma. 
B, C. i^egleri, F. E. Fritsch, n. sp. a and h, the ends of two cells enlarged. 
C, Peniummargaritaceum (Ehrenb.), Breb., var. irregularius, W. & G. S. West. 
D, P. minutum (Ralfs), Cleve, var. producfnm, F. E. Fritsch, nov. var, 
A X 225; B and C x 375; a,h and D x 750. 
inflatis, polos versus magis curvatis et sensim attenuatis ; apicibus incras- 
satis, oblique truncatis, et illic laterem dorsalem versus plus minus profunde 
excavatis ; membrana glabra rubra vel rubiginosa ; suturis medianis 1-6 ; 
cellulis granulis amylaceis magnis repletis, ita ut chromatophora et pyrenoides 
(in serie axiali?) obscurantur. Dist. inter apic, 195-210 /x ; lat. med., 
24-25 fi. 
