BIIIANG TILL K. SV. VET.-AKAD. IIANDL. BAND 21. AFD. III. N:0 2. 25 



II. Pseudoraphidese. 



Surirella Turpin. 



S. robusta Ehb. — V. H. LXXI, 1, 2. 

 Jm. G. — Rare. 



S. spleudida EiiB. — V. H. LXXII, 4. 



Kv. 26, Jm. 6, Km. 10, Ke. 49. — Rather rare. 



S. linearis W. Sm. — A. S. XXIII, 33. 

 Kv. 32, Nu. 17. — Rare. 



S. lapponica A. Cl. n. sp. — Pl. I, 26. 



Valve linear with euneate ends, O, o c to O, o: mm. in 

 length, 0,01 mm. in breadth. Costae 6 to 7 in 0,oi mm., not 

 reaching to the middle of the valve; striae 27 to 2S in O.oi 

 mm., pervions, delicate. 



Kv. 26, Tr. 38. — Rare. 



Thi.s species may possibly be identical with S. delicatissiiaa 

 Lewis, fig. 4, which is of about the same size, but has 7 to 

 9 costae in 0,oi mm., according to the tigure. No number of 

 striae is given by Lewis. 



S. Lagerheimii A. Cl. n. sp. — Pl. I, 27. 



Valve linear, tapering towards the narrower, bnt still 

 obtuse, ends, 0,o.t mm. in length, 0,oo5 mm. in breadth. Costae 

 6 in 0,01 mm., marginal; striae pervions, delicate, 21 in 0,oi mm. 



Nu. 25. — Rare. 



Stenopterobia Bréb. 



S. anceps Bréb. — Surirella anceps Lewis, fig. 3. 

 Kv. 1. — Rare. 



Nitzschia (Hassall) Grun. 



Sectio: Tryblionella. 



N. angtistata var. acuta Grun. — A. D. p. 70. 



Kv. 1, 26, Jm. 6, Ks. 15, 20, S.-K. 7, Tr. 38, Tj. 42, Ke. 49. 

 — Frequent. 



