— 129 — 



G. siamensis forma minor. Tab. nostr. I, fig. 8. 

 L. 0,023 mm., b. 0,oi mm. Gostæ 7 in 0,01 mm. 

 Solitary in a sample from KKt. 



Synedra Ehb. 



79. S. affinis Ktz. 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 striæ in 0,01mm. 



KKm, KKt, KCg (3 samples). 



Area: the main species probably ubiquitous. 



80. S. cuneata Grun. Perag. Diat. de Fr. tab. LXXVIII, figs. 1—2. 

 KMn-CLt, s.l. (°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. S. fulgens Grev. V. H. Syn. tab. XLIII, 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 KKt. 



Area: Adriatic. 



83. S. Hennedyana Greg. V. H. Syn. tab. XLII, fig. 3. 

 KKt, KMn-CLt (6 samples). 



Area: the coast of Europe, Ceylon, Malay Archipelago, Hawaii. 



84. S. laevigata Grun. Grun. New Diat. Hond. tab. I, fig. 3. 

 KKm, KKt, KCg (14 samples). 



— — var. hyalin a 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. lævigata, 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. Striæ very fine. 



85. S. superba (Ktz.) Grun. Perag. Diat. de Fr. tab. LXXIX, fig. 7. 

 Found only in a sample from LN. 



Area: Europe. 



Botanisk Tidsskrift. 26. Bind. 9 



