A. CLEVE-EULER, DIAT. FLORA OF FINLAND. 19 



Distr. {fresh or slightly brack, iv.): Gulf of Bothnia, Dan- 

 mark, England, Balaton-lake. 



Cymbella (Encyonema) fennica n. sp. — PI. 1, f. 15. 



Valve elongated rhombic — elliptical, scarcely unsymmetri- 

 cal, obtuse, 44 a in length, 13 a in breadth. Areas small. Ter- 

 minal fissures distant from the ends. Striae 10 in 10 [j., 

 radiate throughout, distinctly lineate. 



Foss.: Ob. Pelso {fresh tv.?). 



This small species is no doubt closely connected with 

 Cymbella lacustris, from which it is distinguished by the 

 broader shape and by the striae being divergent also at the 

 ends. This feature is shown also by Cymbella Mölleriana 

 Grun. (Cleve, Syn. Xav. D. I, p. 167) that, however, has a 

 large, orbicular central area. 



Cymbella (Encyonema) recta n. sp. PI. 1, f. 16. 



Valve strongly asymmetrical, semielliptical, centrally gib- 

 bous on both sides. Ends slightlj,^ protracted and inclined 

 downwards, subacute. Terminal nodules at a distance from 

 the ends, terminal fissures inclined downwards. Length 40 a, 

 breadth 18 a. Striae 8 in 10 a, punctate. 



Foss.: Ab. Hindersmossen, rare {fresh w.?). 



This species seems to be allied to Cymbella prostrata, as 

 well as C. Jordani Grün. (Cleve, Syn. Xav. D. I, p. 169), 

 and also to a dorsally more arcuate form, intermediate be- 

 tween Encyonema prostratum and E. caespitosum, drawn in 

 A. S. Atl. Tab. 11, f. 36, that perhaps is identical with C'ym- 

 hella {Encyonema) turgida var. obiusa 0. M. Bac. aus Süd- 

 Patag. Tab. 1, f. 19. 



Cymbella lanceolata KCtz. var. infläta n. var. — PL 1, 

 f. 17. 



Valve 110 ;j. in length, 25 a in breadth in the strongly 

 gibbous middle. Striae parallel to the ends, 7,5 (middle) — 9 

 (ends) in 10 u., punctate. 



Foss.: Ab. Hindersmossen, rare. 



This form has the same number of striae as the var. 

 cornuta Ehb. (0strup, Danske D. Tab. 2, f. 43), but is shorter 

 and more gibbous. A very similar, perhaps identical form is 

 Cymbella Cistula var. gibbosa Brun from Switzerland (Diato- 

 miste II, Tab 14, f. 27). 



