20 Caroline Le e caaeh. 



Navicula ihynclwcephala Kürz. 

 (Fig. lob.) 



V. H. S. p. 84, pl. 7, f. 30. 

 Brackish water. 



Navicula viridula Kütz. 



(Fig. 16 c.) 



V. H. S. p. 84, pl. 7, f. 25. 

 Fresh water. 



Nitzschia Sigma f. elongata W. Sm. 



( Fig. 1 7 a. | 



V. H. S. p. 179, pl. 6K, f. 7. 

 Brackish water. 



NiUschia sp. 



(Fig. 17c.) 



Small linear cells with tapering ends seen from the valve-side. This species occurred 

 here and there at stations F 23, F 61, F 50 and F 41. 



Ehabdoneina arcuatum (Au.) Kütz. 



(Fig. 18 d.) 



V. H. S. p. 1 H«, pl. 54, f. 14. 

 Marine littoral form. 



Rhoicosphrnia curvata Grun. 



(Fig. 17 d.) 



V. H. S. p. 127, pl. 26, f. 1—3. 

 Fresh and saline water. 



Stau roneis Heufleri Grun. 



(Fig. 17e.) 



V. H. S. pl. 4, f. 1 A. 

 1894—95 Cleve I, p. 130. 



Fresh water. 



Tom. XLV1II. 



