129 981 
G. siamensis forma minor. ‘Tab. aostr. I,. fig. 8. 
L. 0,023 mm., b. 0,01 mm. Coste 7 in 0,01 mm. 
Solitary in a sample from K Kt. 
Synedra Ehb. 
79. §. affinis Kitz. var. Cnfr. V.H. Syn. tab. XLI, fig. 15 B. 
The present variant has the same shape as the figure by V. Heurck 
quoted above, but only 11—12 strie in 0,01 mm. 
KKm, KKt, KCg (8 samples). 
Area: the main species probably ubiquitous. 
80. §S. cuneata Grun. Perag. Diat. de Fr. tab. LXXVIII, figs. 1—2. 
KMn—ClLt, s.1. (2 samples). 
Area: Banyuls, Honduras, Ceylon, Java. 
81. S. formosa Hantzsch. Hantzsch Ost. tab. V, fig. 3. 
KKt, KCg—KL, LN (11 samples). 
Area: Madagascar, East India Archipelago. 
82. §. fulgens Grev. V.H. Syn. tab. XLII, figs. 1—2. 
KKt (2 samples). 
Area: Europe, Borneo. 
— — var. gigantea Lob. Perag. Diat. de Fr. tab. LXXIX, fig. 6. 
Found only in a sample from K Kt. 
Area: Adriatic. 
83. §. Hennedyana Greg. V.H. Syn. tab. XLII, fig. 3. 
KKt, KMn—CLt (6 samples). 
Area: the coast of Europe, Ceylon, Malay Archipelago, Hawaii. 
84. §. levigata Grun. Grun. New Diat. Hond. tab. I, fig. 3. 
KKm, KKt, K Cg (14 samples). 
— — var. hyalina Grun. Grun. 1. c. fig. 5. 
Scattered among the main species. 
Area: Honduras, Mauritius, Samoa, Ceylon. 
NB. In a sample from KCg I have found a Synedra, probably a 
variety of S. laevigata, in its outline agreeing with Syn. affinis gracilis 
V.H. Syn. tab. XLI, fig. 15 B. L. 0,2 mm., b. 0,005 mm., in the middle 
a little broader. Apices slightly capitate. Striee very fine. 
85. §. superba (Ktz.) Grun. Perag. Diat. de Fr. tab. LXXIX, fig. 7. 
Found only in a sample from LN. 
Area: Europe. 
