BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 24. AFD. III. N:0 2. 9 



Hantzschia aniphioxys (Ehb.). — Common. — L. 0,o6; B. 0,oi 

 mm. Puncta 6. Str. 22 in 0,oi mm. 



v. hyperhorea Grun. (Fr. Jos. Land. Diat. I, 59). — L. 0, 15; 

 B. 0.015 mm. Puncta 6. Str. 14 in 0,oi mm. — Cape Flora, 

 in some samples. 



Meridion circulare Ag. — Verv common. 



Fragilaria lapponica Grun. v. minida A. C. — L. 0,oi; 

 B. 0,003 mm. Str. 10 in 0,oi mm. — Very rare. Cape Flora. 



F. noäosa Cl. N. sp. — Valve gibbous in tiie middle, 

 with broad, rounded ends. L. 0,oi4 — O.017; B. 0,oo35 mm. 

 Axial area narrow linear, or slightly dilated in tbe middle. 

 Strife strong, 12 — 13 in 0, 01 mm. — Sparingly in several 

 samples. — Fig. 8. 



F. Icevissitna Cl. N. sp. — Valve more or less rhomboid,. 

 with broad rounded ends. L. 0,oii — 0,oio; B. 0,oo4 mm. — 

 No striation seen. — Abnndant in one sample from Cape 

 Flora. — Fig. 9. 



Synedra Vaucherice Kutz. {Fragilaria interniedia Grun.). — 

 Not rare in several samples. — (L. O, o 3 — 0,03.5; B. 0,oo3— 0,oo3& 

 mm. Str. 14 in 0,oi mm.). 



Fragilaria capucina Desm. — Valve linear, with cnneate 

 ends. L. 0,025; B. 0,oo3 mm. Axial area narrow lanceolate. 

 Str. 20 in 0, 01 mm. — Common in some samples from Cape 

 Flora. 



F. arcus Kutz. (Ceratoneis arcus Auct.). — Very common. 



var. reda Cl. (Fragilaria capucina v. inccquidentata Lägst. 

 Spitsb. D. 16, II, 1). — L. 0.06; B. 0,oo4 mm. Str. 17 in 

 0,01 mm. — Common, frequently together with F. arcus. 



The only difference between Ceratoneis arcus and the 

 v. reda is the arcuate flexure of the frustnle of the former, 

 as already Dr Lagerstedt has remarked. 



