14 
Transactions of the Royal Society of South Africa. 
Genus DICTYOSPHAEEIUM Naegeli. 
1. Bictyosphaevium ]3ulchelhim, Wood, Fresliw. Alg. N. America, Smith- 
sonian Contrib., xix. No. 241, 1872, p. 84, PI. X, fig. 4. 
Sample 159 (very rare). 
Genus ANKISTEODESMUS Corda (EHAPHIDIUM Kuetz.). 
1. Anhistrodesmus falcattis (Corda), Ealfs, Brit. Desm., 1848, p. 180. 
(Syn. : Rhaphidium fasciculatiim, Kuetz. ; R. ijolymorphum, Fresen., var. 
falcatum, Eabenh.) 
Sample 327 (rare). 
Previously recorded from Cape Colony and Orange Free State (Fritsch). 
Addendum : Genus of doubtful position. PLEUEOCOCCUS Menegli. 
1. Pleurococcus vulgaris, Meneghiui, Monogr. nostocli. Ital., Att. E. 
Acad. Sci. Torino, ser. 2, v, 1842, p. 88, PL Y, fig. 1. 
Sample 832. 
2. Pleurococcus dissectus (Kuetz.), Naegeli, Gatt. einzell. Alg., 1849, p. 65, 
Tab. lY, E, fig. 3. (Syn. : Protococcus dissectus, Kuetz.) 
Sample 339 (attached to various substrata, especially common on TJtricu- 
laria sp.). 
This species is evidently of wide distribution in the Southern Hemi- 
sphere. It has been recorded by G. S. West from Angola and plays an 
important part in the Antarctic algal flora. In all these cases, as in the 
present instance, the species grows submerged, whereas in other regions it is 
subacrial. 
(e) ULOTEICHALES. 
(1) ULOTKICHACEAE. 
Genus ULOTHEIX Kuetzing. 
1. Ulothrix siihtilissima, Eabenhorst, Krypt. Flora v. Sachsen, etc., I, 
1863, p. 263 ; Heering, Ulotrichales, etc., in Pascher, Suesswasserfl. Deutsch- 
lands, etc., vi, 1914, p. 32, fig. 27. 
Samples 338, 339, 340 (in all cases rare). 
Previously recorded from Cape Colony (Fritsch). 
2. Ulothrix tenerrima, Kuetzing, Phyc. gen., 1843, p. 253, PI. IX, fig. 1 ; 
Heering, op. cit., p. 32, figs. 28-30. 
Samples 20, 21, 28, 29. 
Previously recorded from Little Namaqualand (G. S. West), 
