88 Annals of the Smith African Museum. 



144. Cosmarium Pseudobroomei, Wollc, var. compressum, G. S. 

 West, in Journ. Linn. Soc. hot. xxxviii., 1907, p. 123, t. 7, f. 11. 



A slightly larger form : long. 40^; lat. 40-42 ^ ; lat isthm. 13 fi. 



Angola. In stream in Cazengo District. 



This variety was first found in the vicinity of Tanganyika. 



145. Cosmarium quadratulum, (Gay) De Toni. 

 Little Namaqualand. In dam at Rozynbosch ; 9.1.09. 



146. Cosmarium subcostatttm, Xordst., forma minor, W.&G. S. West. 

 Zygospore globosae, verrucis truncatis (ad marginem 9 visis) 



obsessae, verruca unaquaque cum granulis 7 circa spinam brevem 

 centralem. (Fig. 38.) 



Long. cell. 26-28 /x; lat. 20-5-23 ,, ; lat. isthm. 7-8^; crass. 

 13-14 /t; diam. zygosp. sine verruc. 24^, cum verruc. 30-32^. 



Angola. In shallow concreted water-conduit at Mossamedes. 



Karoo. In sulphureous spring at Pappekuil ; 2.12.08. In similar 

 spring at Gansfontein ; 2.12.08. 



Little Namaqualand. In dam at Pella ; 8.1.09. Among other 

 algae at Eozynbosch, with zygospores ; 9.1.09. 



This small form was first described from Angola in 1897, but has 

 since been shown to have a wide geographical distribution, especially 

 in the tropics. No zygospores of the species have previously been 

 observed. 



147. Staurasti am alternans, Breb. 



Forma angulis leviter subrotundatioribus : long. 26 j.i ; lat. 22 ^ ; 

 lat. isthm. 9 - 5 p. 



Little Namaqualand. On wet mud in dam at Pella ; 8.1.09. 



148. Staurastrum subdilatatum, W. & G. S. West. 



Forma granulis paucioribus validioribusque : long. 23-26 fi ; lat. 

 21-25 h t; lat. isthm. 8-5-9 h i. 



Little Namaqualand. Among Chara sp. floating in dam at Pella ; 

 8.1.09. 



Ordek (EDOGONIALES. 



Family (EDOGONIACEiE. 



149. CEdogonium inversum, Wittr., in Ofvers. af K. Vet.-Akad. 

 Forhandl. No. 6, 1876, p. 47, t. 13, f. 22-24. 



Crass, cell, veget. 14-18/1 ; altit. 2-3^-plo major ; 



„ oogon. 28-30 A <; „ 27-30^; 



„ oospor. 26-29 fx; „ 24-28 fi. (Figs. 49, 50.) 

 Great Namaqualand. In cattle-trough at Griindoorn ; 4.2.09. 



