600 A a in i/s of the South African Muse inn. 



Genus SURIRELLA Turpin. 



1. Surirella ovalis, Breb. ; Van Heurck, op. cit., p. 188, PI. LXXIII, 

 fig. 2. 



Sample 5. 



Long., 72-81 /x; lat„ 37-43 /x. 



Recorded from tlie Halle River, Calvinia Division, and Little 

 Namaqualand, by Gr. S. West. 



2. Surirella linearis, W. Smith, Brit. Diat., i, 1853, p. 31, PI. VIII, 

 fig. 58. 



Sample 48. 



Forma minor. Long., 36 p. ; lat., 8-9 /x. 



V. FLAGELLATA. 



D. EUGLENINAE. 



Genus EUGLENA Ehrenberg. 



1. Euglena oxyuris, Schmarda ; Lemmermann. in Suesswasserflora 

 Deutschlands, Oesterreiclis, u. d. Schweiz., Heft 2, 1913, p. 130, 

 fig. 207. (Fig. 42, A.) 



Samples 3 and 4 (not uncommon). 



Long., 180-195 fx ; lat., 21-27 /x. The dimensions are appreciably 

 smaller than those given by Lemmermann, but otherwise the speci- 

 mens agree well with the diagnosis. The cells are elongated and 

 spirally twisted, often in a complicated manner. The periplast is 

 provided with spiral striation, which, under higher powers, is seen to 

 be composed of lines of closely arranged punctae. The oval nucleus 

 (dark in Fig. 42, A) lies approximately in the middle of the cell, and 

 there is a ring-shaped paramylon-grain in front and behind it. 



2. Euglena, n. sp. (?). (Fig. 42, B.) 

 Samples 14 and 15 (not uncommon). 



I think it probable that this is a new species, but that could only be 

 certainly established by examination of fresh material. The cells are 

 certainly highly metabolic, as the specimens show great diversity of 

 shape ; in general, however, the form of the cell is elongated, usually 

 with the greatest breadth near one end. The anterior extremity 

 appears produced as a blunt knob, and this feature is distinguishable 

 in all the individuals, no matter how distorted their shape. At this 

 point a slight orifice, from which no doubt the llagellum arises, can be 



