80 Annals of the South African Museum. 



Lat. cell, centr. 13-27 ti\ lat. cell, margin. 17-30^; lat. coenob. 

 (sine proc.) 32-68 fi ; long. proc. 2-4-6 ll. (Figs. 30-32). 



Little Namaqualancl. In dam at Pella ; 8.1.09. 



The very compact coenobium, the entire character of the marginal 

 cells, and the oblique disposition of the small marginal processes, are 

 the distinguishing features of this species. It should be carefully 

 compared with P. integrum, Nag. 



It was not uncommon in the dam at the above locality, and no 

 other species of the genus occurred with it. 



Order SIPHONALES. 



Family VAUCHEEIACE/E. 



107. Vaucheria sp. 



Angola. In stream in dense forest in Cazengo District. Crass, fil. 

 150-166 p. Only sterile filaments were observed, and some of these 

 were clothed with numerous colonies of the epiphyte Chanuzsiphon 

 gracilis, Babenh. 



Order SIPHONOCLADIALES. 



Family CLADOPHOBACEvE. 



108. Bhizoclonium hieroglyphicum, Kiitz. ; em. Stockm. 

 Crass, fil. 21-5-25 /x. 



x\ngola. Among Vaucheria sp. in stream in dense forest in 

 Cazengo District. 



The specimens were fairly typical, and many of the filaments were 

 encrusted with colonies of Ghanuesiphon incrustans, Grim. 



Var. (Fig 35.) 



This approaches var. riparium, (Harv.) Stockm., but the transverse 

 walls were of considerable thickness (15-17 f.i) and there were no 

 " rhizoids." Cras. fil. 33-31 ll. Numerous plants of Uronema 

 confervicolum, Lagerh., were epiphytic on the filaments. 



Upper (or Composite) Begion. Holle Biver, attached to the rocky 

 sides of stagnant pools ; 10.12.08. 



Family SPHiEBOPLEACE^E. 



109. SpJueroplea annulina, (Both) Ag. 



Crass, coenocyt. 42-16 jx ; diam. oospor. matur. 16-24 p. 

 Little Namaqualand. Floating in dam at Bozynbosch ; 9.1.09. 



