10 ARKIV FÖR BOTANIK. BAND 14. N:0 9. 



Scoliotropis Cl. 



Scoliotropis septentrionalis n. sp. — Pl. 1, f. 5. 



Valve broadly linear with cuneate ends. Median line 

 «urved towards both ends in the same direction. Axial area 

 indistinct, slightly dilated round the small central nodule. 

 Close to the median line there is on both sides a longitudinal 

 line or keel, and between these lines a furrow. Structure: 

 oostae, 7 in 10 [j-, parallel to the ends, where they are slightly 

 curved upwards. Between the costae double rows of minute 

 puncta or lineolae, forming in appearance obscurely pearled 

 striae. Between the keels, the double rows of lineolae con- 

 tinue as stronger pearls or puncta. Length of the valve 

 180—200 ;j.; breadth? 



Foss.: Kk. Knjasha, rare. {m.ar.) 



Of this large and interesting species, obviously akin to 

 Scoliotrojns latestriata Bréb. var. Amphora Cl. (Syn. Nav. I, 

 p. 72), I unfortunately have found only a few broken valves, 

 that do not allow me to give a complete description. As I 

 have not seen the dorsal side at all, I do not know if it has 

 the same breadth as the ventral, that is 30 — 35 [x broad. 



Diploneis Ehb. 



Diploneis coflfaeiformis A. S. Atl. Tab. 8, f. 7. 

 Foss.: Nyl. Kj^rkslätt {Clypeus-strsita). 

 Distr. (mar.): North Sea, Mediterr., Macassar Str.; Cali- 

 fornia (foss.). 



Diploneis subcincta (A. S.). — Syn. Navicula subcincia 

 A. S. Atl. Tab. 13, f. 41, Tab. 69, f. 32. Grunow, Franz 

 Jos. L. D. Tab. 1, f. 38. 



Foss.: Kk. Knjasha, Koudajärvenpää, frequent. 



Distr. (mar.): East Greenland, East Arctic Sea, Adriatic, 

 Atlantic, Pacific Ocean, Antarctis. (Foss.) Japan, Aegina, 

 Maryland, California. 



Diploneis Entomon (Ehb.) A. S. — Cleve, Syn. Nav. 

 D. I, p. 87 (not Donkin). Syn. Navicula bomboides var. media 

 Grun. a. D. Tab. 3, f. 54, >>Navicida subcincta Schm.» Grunow 

 Franz-Jos. L. D. Tab. 1, f. 39 (fig. 3S is a true subcincta). 



