254 36 
Solitary in a sample from Lem Dan. 
Area: the main species, Europe, America, Java. var. producta: according 
to de Toni (Syll. p. 786) ,,cwm specie hine et inde“ 
Eunotia Ehr. (1837). V.H. Traité p. 298. 
44, E. major (W. Sm.) Rabh. var. octoundulata Grun. Grun. Banka, 
tab. 1, fig. 8. 
Lem Dan (two samples). 
Area; Banca, 
45, E. parallela Ehr. Grun. Banka tab. I, fig. 3a. 
Lem Dan. 
forma angustior V.H. Syn. tab. XXXIV, fig. 16. 
Lem Dan. 
Area: Greenland, Europe, America, Banca. 
46, , pectinalis (Ktz.) Rabh. var. stricta Rabh. V.H. Syn. tab. 
XXXII, fig. 18. 
Lem Dan (3 samples). 
var.? minor (Ktz.) Rabh. V.H. 1c. figs. 20—21. 
Klong Son, Lem Dan (5 samples). 
forma curta. V.H. l.c. fig. 15. 
Lem Dan. 
Area: Europe, America. 
var. undulata (Ralfs) Rabh. in Grun. Banka, p. 4, tab. I, figs. 5a—e. 
Lem Dan (11 samples). 
I found forms agreeing with the figures by Grunow quoted above 
and with W.Sm. Syn. tab. XXXII, fig. 281 a, but not with V.H. Syn. 
tab. XXXIII, fig. 17. 
Area: England, Banca. 
47. ¥. prerupta Ehr. var. bidens Grun. enfr. V.H. Syn. tab. XXXIV, 
fig. 20. 
Lem Ngob. 
Only one small specimen observed (L. 0,04 mm.), in its shape quite 
agreeing with the quoted fig. by V. H., but I was not able to see any 
sculpture on its striz. 
Area: Type arctic and alpine. 
48. , robusta Ralfs var. bigibba Ost. var. nov. tab. nost., fig. 13. 
L. 0,06 mm., strie along the ventral margin 10 in number in 
0,01 mm., towards the apices closer, finely transversely inesved 
Terminal nodi somewhat removed from the apices. 
