A. CLEVE-EULER, DIAT. FLORA OF FIXLAND. 49 



Foss.: Sat. Panelia, with the type. 



A similar form is figured, without name, in A. S. Atl. 

 Tab. 21, f. 5. It was taken by the Hoyes-Exp. in the Arctis. 



Surirella elegans Ehb. — V. H. Syn. Tab. 71, fig. 3. 

 A. S. Atl. Tab. 21, f. 17 — 19. Syn. Surirella slesvicensis Grun. 

 A. S. Atl. Tab. 21, f. 19; Surirella norvegica Eulenst. A. S. 

 Atl. Tab. 21, f. 17. 



Ladoga. Foss.: Ab. Hindersmossen, Nyl. Kyrkslätt. 



Distr. [fresh w.): ubiquist; frequent in old deposits from 

 the Ancylus-e^och . 



Surirella Gemma Ehb. — V. H. Syn. Tab. 74, f. 1—3. 



Foss.: Sat. Panelia, rare. In deposits from the LtVorma- 

 epoch. 



Distr. {mar. and brack.): Arctis, Antarctis, ubiquist. 



Surirella fossilis n. sp. — PI. 3, f, 61.^ 



Valve isopolar, elliptical with subacute ends, 56 p. in 

 length, 36 a in breadth. Wings marginal, making one fold 

 in 4 ;j-, producing depressions on the valve, visible on half 

 the space between the margin and the raphe, that is faintly 

 marked. Striation fine, delicate, visible all over the valve. 



Foss.: Kk. Knjäsha, in marine strata; rare. 



This species seems to be akin to *S'. septeiitrionalis 0ste. 

 (Mar. D. Dst-Gronl. Tab. C, f. 78) from East Greenland. 



Surirella laevis n. sp. — PI. 3, f. 60.^ 



Valve heteropolar, broadly ovate, 55 a in length, 33 a 

 in breadth. Wings marginal, with one fold in 4 a, producing 

 rather short, triangular, delicately striate depressions. Sculp- 

 ture of the central part of the valve hardly visible. 



Foss.: Sat. Panelia, in deposits from the Z/?Vorma-epoch. 



Surirella Lindbergii n. sp. — PI. 3, f. 62. 



Valve slightly heteropolar, ovate, 42 \i in length, 26 u. in 

 breadth. Wings marginal, 3 folds in 10 a, producing triangular 

 depressions ending about twice as far from the central axis 

 as from the border. Depressions finely striate, as also the 



' On the plate, the names of S. laevis and S. fossilis have been errone- 

 ously exchanged. 



Arkiv für botanik. Band Ii. X:o 9. 4 



