62 ERNST 0STRI/1' 



size, or it is perhaps related to Dent, lauta Hail. (V. H. Syn., Tab. XLIX, 

 figs. 12), but it is hardly identical with either of these. 



Denticula subtilis Grun. V. H. Trt. 352, Tab. XI, fig. 4(54. 

 5 samples (SAY. 2, E. 3). 

 Area: Eur., Af., As., Am. 



Denticula tenuis Ktz. V. H. Trt. 352, Tab. XI, fig. 461. 



5 samples :S.W. 3, E. 2). 

 Area: Eur.. Af., As., Am. 



Diatomella Greville 1855. V. H. Trl. 35;}. 



*Diatomella Balfouriana Grev. V. H. Trt. 353, fig. 104. 



168 samples (S. 20, S.W. 55. NAY. 5, X. 34, E. 5 4 . Hot springs: 7. 



Area: Ear., Am., Grl., B. E., Spb., Fz. J. 



Tabellaria Ehr. 1839. V. H. Trt. 356. 



*Tabellaria fenestrata (Lyngb.) Ktz. V. H. Trt. 356, Tab. XI, 

 fig. 477. 



108 samples (S. 17, SAY. 39, NAY. 2, N. 7, E. 43). Hot springs: 2. 

 Area: Eur., At'., As., Am., Grl. 



*Tabellaria flocculosa (Roth) Kl/. V. H. Trt. 357, Tab. XI, fig. 478. 

 192 samples (S. 36. S.W. 60, N. W. 6, N. 28, E. 60, s. 1. 2 . Hot 

 springs: 10. 



Area: Eur., Af., As., Am., Grl., J. M., B. E., Spb., Fz. J. 



Tetracyclus (Raffs) Grun. 1862. V. H. Trt. o57. 



Tetracyclus emarginatus W. Sm. W. Sin. Syn. II, 38. Herib. Auv., 

 Tab. Ill, fig. 27. 



30 samples ;S. 4, SAY. 14, N. 5, E. 7). 

 Area: Eur. 



