Contributions to Our Knowledge of the Freshwater Algae of Africa. 15 
3. TJlothrix variabilis, Kuetzing, Spec. Alg., 1849, p. 346 ; Heering, 
op. cit., p. 32, fig. 27. 
Sample 345 (common). 
Previously recorded from Cape Colony (Fritsch). 
4. TJlothrix moniliformis, Kuetzing, Spec. Alg., 1849, p. 347 ; Heering, 
op. cit, p. 33, fig. 32. 
Sample 24 (?). 
Cells definitely constricted ; diam. 14-15 /x. 
[Note. — Fragments of a species of this genus were also present in 
sample 17.] 
Genus HOEMIDIUM Klebs. 
1. Hormidium fiaccidum, A. Braun ; Heering, op. cit., p. 46, figs. 48, 49. 
Samples 100, 332 (in the latter case rather fragmentary). 
Genus GEMINELLA Turpin. 
1. Geminella interrvpta, Turpin, Mem. d. Mus. d'hist. nat., xvi, 1828, 
p. 329, Tab. XIII, fig. 24 ; Heering, op. cit., p. 41, fig. 45. 
Samples 311, 312, 314 (rather common in 311). 
Lat. cell., 6-7 /x ; long, cell., ad 15 ; lat. vag., ad 33 ju. 
(2) ULVACEAE. 
Genus ENTEEOMORPHA Link. 
1. Enteromorpha basiramosa, F. E. Fritsch, n. sp. (Figs. 4, 5). 
E. parva, ad 2 cm. longa, rupibus vel plantis aquaticis adhaerens ; thallo 
angustissimo tubuloso, ad basin copiose insuper parcissime ramoso, ramis in 
parte superiore plerumque brevibus uni- vel raro bi-seriatis ; filis primariis 
usque ad 500 crassis, flexuosis, apicibus plerumque abruptis, sed interdum 
in cellula singula terminatis, cellulis saepe in seriebus longitudinalibus 
distinctis, interdum leviter spiralibus, dispositis, sed in filis latissimis sub- 
irregulariter ordinatis ; cellulis non elongatis formae variabilis, in filis latis- 
simis cytioplasmate saepe in membranam exteriorem incrassatam papilliforme 
porrecto, pyrenoidibus 1-2 ; discus adhaerens flabelliformis e seriebus arctis 
radiantibus cellularum angustarum constans. 
Lat. fil. prim., 45-500 m : lat. ram. 1-2 seriat., 15-18 /x ; crass., cell., 
7-12 
Samples 323, 325, 330. 
This species appears to occur not uncommonly in the brackish water 
near the mouths of the rivers in Kentani. None of the thalli in the three 
samples reached any considerable dimensions, but some at least seemed to 
present the mature condition. E. basiramosa therefore belongs to the Entero- 
