37 
{SS} 
or 
ou 
Klong Majum, Klong Munsé. (3 samples). 
With hesitation I regard this form as a variant of E. robusta. It 
is not identical with E. rob. Papilio, nor with EB. Diodon as far as I 
can judge. 
49. E. Diodon Ehr. forma minor V.H. Syn. tab. XXXIII, fig. 5. 
Lem Dan. 
Area: the main species: Europe. 
50. E. lunaris (Ehr.) Grun. var.? alpina (Negeli) Grun. V.H. Syn. 
tab. XXXV, fig. 5. Grun. Banka tab. I, fig. 9. 
Klong Munsé, Klong Son, Koh Samit, Lem Dan: (6 samples.) 
Area: Europe, India, Java, Banca. 
51. E. Camelus Ehr. genuina Grun. Grun. Banka tab. I, figs. 6a 
and b. 
var. denticulata Grun. Grun. |. c.. fig. 6d. 
Lem Dan (7 samples). 
Area: Europe, America, Banca. 
52. EE, costata Ost. nov. sp. tab. nostr., fig. 14, 
L. up to 0,09 mm., B. up to 0,007 mm., costee 5 in 0,01 mnt. 
Valve arcuate with parallel dorsal- and ventral margin, terminal 
nodi on the ventral side, a little removed from the rounded apices. 
Coste prominent forming denticuli on the dorsal margin. The 
frustule rectangular with finely striated connecting zone. 
Klong Prao, Klong Majum, Klong Munsé, Klong Son, Koh Samit, Lem Dan. 
(8 samples). Not common in any sample. 
Desmogonium Ehr. (1848). Grun. Banka p. 5. 
53. D. Rabenhorstianum Grun. Grun. Banka tab. J, fig. 1. 
Lem Dan (3 samples). 
Area: China, Banca. 
var erassa Ost. var. nov. tab. nostr., fig. 15. 
L. 0 mm., B. 0,008 mm, Strize 14—16 in 0,01 mm. Denticuli 
7—8 in 0,01 mm. 
Naval Station, Lem Dan (3 samples). 
Shorter and broader than the type. Apices somewhat inflated. 
Synedra Ehr. (1831). V.H. Traité p. 307. 
54. §. Ulna (Nitzsch) Ehr. V. H. Syn. tab. XXXVIII, figs. 9, 12 
and 14. 
Klong Prao, Klong Majum, Klong Munsé, Klong Sarlakpet, Lem Dan. (7 
samples). 
