— 35 — 



36. A. microcephala Ktz. V. H. Syn. tab. XXVII, figs. 20-23. 

 Klong Majum. 



Area: Europe, Bandong. 



37. A. linearis W. Sm. V. H. Syn. tab. XXVII, figs. 31-32. 

 Klong Majum, Klong Munsé, Lem Dan. (5 samples.) 



var. pusilla Grim. V. H. I. e. figs. 33-34. 



Klong Majum. 



Area: the main species: Europe, var. pusilla: also in Greenland. 



38. A. exilis Ktz. V. H. Syn. tab. XXVII, figs. 16-19. 



Klong Majum (two samples). 

 Area: Europe, Abyssinia. 



39. A. affinis Gran. V. H. Syn. tab. XXVII, figs. 39-40. 



Klong Majum, Klong Munsé. 

 Area: Europe, America, Tasmania. 



Achnanthidium CI. 1. c. p. 191. 



40. A. rostrata Öst. n. sp. tab. nostr., fig. 11. 



L. 0,012 mm., B. 0,006 mm. Striæ 10 in 0,01 mm. The outline 

 of both valve identical: elliptical with rostrate apices. Epitheca 

 with an unilateral horseshoe-shaped mark, Hypotheca: central pores 

 approximate, unilateral central area. 



This small species is obviously nearest to A. lanceolate/, (Bréb.) Grun. 

 var. dubia Grun. (V. H. Syn. tab. XXVII, figs. 12 — 13). 



Klong Sarlakpet. 



41. A. baccata Leud.-Fortm. GI. Syn. II, tab. III, fig. 3. Leud.- 

 Fortm. Ceylon tab. I, fig. 5. 



In a slide from Klong Prao I found a specimen thus situated, that 

 it was quite agreeing with the figure by L.-F. quoted above, which is 

 referred with some doubt to A. baccata by P. T. Cleve (I.e. p. 195). 



Klong Prao, Klong Majum, Klong Sarlakpet, only in samples labelled: „in 

 waterfall". 



Area: Ceylon. 



Epithemia Bréb. (1838). V. H. Traité p. 294. 



42. E. Argus (Ehr.) Ktz. var. 

 Klong Prao, Klong Majum. Rare. 



As the present form differs from the type by its pronounced curva- 

 tion I have figured it in tab. nostr., fig. 12. 



Area: the main species: Europe, Java. 



43. E. gibberula (Ehr. ?) Ktz. var. producta Grun. V. H. Syn. tab. 

 XXXII, fig. 12. 



3* 



