Fresh-water Algae. 81 



This alga was mixed with species of CEdogonium, and a number of 

 Desmids and Protococcales. The transverse walls of the filaments 

 were 7-8 /.t in thickness. In all the filaments examined were ripe 

 oospores. 



Oedee ULYALES. 



Family ULVACEiE. 



110. Enteromorpha intestinalis, (L.) Link. 

 Diam. cell. 8-16 /x. 



Upper (or Composite) Kegion. In shallow stream (" brakwater ") 

 smelling of sulphuretted hydrogen at Kopje's Kraal ; 12.12.08. 



111. Enteromorpha gracillima, G. S. West, sp. n. 



E. pallide viridis, lapides irroratos in rivulo affixa ; thallo 

 9-16 cms. longo, angustissimo, tubuloso, capillare et ramoso; fills 

 primariis usque ad 250 ft crassis, flexuosis ; ramis angustioribus, 

 64-110 /j. crassis multe elongatis et flexuoso-undulatis, apicibus 

 breviter et gradatim attenuatis sed non monosiphoniis ; cellulis 

 subin-egulariter polygonatis, 9-23 fx crassis ; vix in seriebus longitu- 

 dinalibus dispositis sed plus minusve irregulariter ordinatis. 

 (Figs. 43, 44.) 



Karoo. In spring smelling strongly of sulphuretted hydrogen at 

 Gansfontein ; 11.1.09. 



Upper (or Composite) Kegion. Attached to stones in shallow 

 stream at Kopje's Kraal; 12.12.08. Water smelling strongly of 

 sulphuretted hydrogen. Another sample was mixed with a sterile 

 species of Spirogyra. 



It does not seem possible to identify this species with any of 

 those already described. It is most certainly not a form of 

 E. plumosa, Kiitz., but it should be carefully compared with 

 E. clathrata, (Both) J. Ag. From the latter it differs in its more 

 slender habit, with fewer, less patent, and more elongated branches, 

 which are, however, much more flexuose. The cells are also much 

 more irregular, both in shape and in disposition . 



It is possible that fully grown plants may exceed 16 cms. in 

 length, as the longest specimens examined did not appear to be 

 quite perfect. For its length it is the narrowest known species of 

 the genus. The branches are narrower than the main axis, 

 of considerable length (up to 9 cms.), and by no means numerous. 



The occurrence of another inland species of Enteromorpha is very 

 interesting. Moreover, species of this genus, although frequently 



