— 37 — 



Klong Majuiii, Klong Mimse. (3 samples). 



With hesitation 1 regard this form as a variant ot L\ robustti. It 

 is not identical with E. rob. Papilio, nor with E. Diodon as far as 1 

 can judge. 



49. E. Diodon Ehr. forma minor V. H. Syn. tab. XXXlll, lig. 5. 



Area: the main species: Europe. 



50. E. lunaris (Ehr.) Grim. var. ? alpina (Naigeli) Crim. V. H. Syn. 

 tab. XXXV, tig. 5. Grim. Banka tab. 1, lig. !). 



Klong Munse, Klong Son, Koh Samit, Lem Dan. ((i samples.) 

 Area: Europe, India, Java, Banca. 



.51. E. Canieius Ehr. gennina Grnn. Grun. Banka tab. I, figs. (5 a 

 and b. 



var. denticulata Grun. Grun. 1. c. lig. 6 d. 



Lem Dan (7 samples). 



Area: Europe, America, Banca. 



52. E. costata Ost. nov. sp. lab. nostr., lig. 14. 



L. up to 0,09 mm., B. up to 0,007 ram., costse 5 in 0,oi mm. 

 Valve arcuate with parallel dorsal- and ventral margin, terminal 

 nodi on the ventral side, a little removed from the rounded apices. 

 Gostae prominent forming dcnticuli on the dorsal margin. The 

 frustule rectangular with fmely striated connecting zone. 



Klong Prao, Klong Majum, Klong Munse, Klong Son, Koh Samit, Lem Dan. 

 (8 samples). Not common in any sample. 



Desmogonium Ehr. (1848). Grun. Banka p. 5. 



53. U. Rabenlioi'stianum Grun. Grun. Banka tab. 1, lig. 1. 

 Lem Dan (3 sami)les). 



Area: (Ihina, Banca. 



var crassa Ost. var. nov. tab. nostr., lig. 15. 



L. 0.1 mm., B. 0,008 mm. Striae 14 — KJ in 0,oi nmi. Denticuli 

 7—8 in 0,01 nun. 



Naval Station, Lem Dan (3 samples). 



Shorter and broader than the type. Apices somewiiat inllated. 



Synedra Ehr. (18:51). V. H. Traite p. 307. 



54. S. Una (Nitzsch) Ehr. V. H. Syn. tab. XXXVIIl , tigs. 9, 1 2 



and 14. 



Klong Prao, Klong Majum, Klong Munse, Klong Sarlakpel, Lem Dan. (7 

 samples). 



