35 253 
36. A. microcephala Ktz. V.H. Syn. tab. XXVH, 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 Grun. V.H. I.c. 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. (G19, 
Klong Majum (two samples). 
Area: Europe, Abyssinia. 
39. A. affinis Grun. V.H. Syn. tab. XXVII, figs. 39— 40. 
Klong Majum, Klong Munsé. 
Area: Europe, America, Tasmania. 
Achnanthidium Cl. |. c. p. 191. 
40. A. rostrata Ost. n. sp. tab. nostr., fig. 11. 
L. 0,012mm., B. 0,006 mm. Strie 10 in 001mm. 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. lanceolata (Bréb.) Grun. 
var. dubia Grun. (V.H. Syn. tab. XXVII, figs. 12—13). 
Klong Sarlakpet. 
41. A. baceata Leud.-Fortm. Cl. Syn. II, tab. I, 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. c. p. 195). 
Klong Prao, Klong Majum, Klong Sarlakpet, only in samples labelled: ,in 
waterfall*. 
Area: Ceylon. 
Epithemia Bréb. (1838). V.H. Traité p. 294. 
4%, KK, Argus (Ebr.) 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. KE. gibberula (Ehr.?) Ktz. var. producta Grun. V.H. Syn. tab. 
XXXIL, fig. 12. 
