39 257 
Scalares V.H. 1. ¢. p. 394. 
60. N. sealaris W.Sm. cnfr. V.H. Syn. tab. LX, figs..14—15. 
Lem Dan (5 samples). In two of the samples not rare. 
Area: Europe, Australia. 
The size of the present form agrees with Grunow’s var. minor (Cl. & 
Grun. aret. Diat p. 83) found in Delaware river and in lagoons at Samoa. 
Obtuse V.H. l.c. p. 397. 
61. N. obtusa W. Sm. var. nana Grun. V.H. Syn. tab. LXVII, fig. 3. 
Lem Dan (4 samples). 
Area: the main species: Europe, America, Japan; var. nana only in 
Haverfordwest (England) enfr. V. H.’s types No. 399. 
Lanceolate V.H. 1. ¢. p. 400. 
62. N. Palea (Ktz.) W. Sm. forma major, V.H. Syn. tab. LXIX, 
fig. 22 e. 
var. minuta Bleisch. V.H. l.c. fig. 23. 
var. tenuirostris Grun. V.H. 1. c. fig. 31. 
var. debilis (Ktz.) Grun. V.H. I. c¢. figs. 283—29. 
Lem Dan (4 samples), Koh Samit. 
Area: the main species: Greenland, Europe, Abyssinia, Japan. 
63. N. intermedia Hantzsch. V.H. Syn. tab. LXIX, fig. 10. 
Koh Samit. 
Area: Europe. 
Nitschiella Rabenh. 1864. V.H. Traité p. 404. 
64. N. longissima (Bréb.) Ralfs. V.H. Syn. tab. LXX, fig. 8. 
Lem Dan, A fragment only. 
Area: Greenland, Europe. 
Coccochromatice. 
Fragilaria Lyngbye (1819). V.H. Traité p. 323. 
65. K. siamensis Ost. sp. nov. tab. nostr., fig. 19. 
L. 0,05—0,08 mm., B. in the middle 0,003—0,0035 mm., strize 20 in 
0,01 mm. Valve constricted in the middle and before the capitate 
apices. Strie parallel, obscure, absent. in the apices. I am not 
able to see any pseudoraphe. 
This characteristic form occurs in chains as Diatoma and Gramma- 
tophora. The endochrom is granulary. 
Klong Munsé, Klong Son, Lem Dan. (5 samples). 
17 
