BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 21. AFD. III. N:0 2. 13 



S. Phoeiiiceiitorou Ehb. — Cl. Syn. Nav., p. 148. 



Var. amphilepta Ehb. — Hér. Auv., pl. III, 18. 



This variety often in its somewhat rostrate forms gra- 

 dnates to S. anceps. Snch transitional forms occnr in Nu. 5. 



Kv. 9, 32, 34, Nu. 5, 17, 19, 41, Jm. 6, 31, S.-K. 22, Tr. 38, 

 Tj. 42, G-1. 43, 47, Gl. D. 44, 45, Ke. 49. — Frequent. 



S. parvula var. promiuiila Grun. — Cl. Syn. Nav. p. 149. 



Kv. 32, Nu. 37. — Rare. 



This form has more acute ends than S. producta Grun., 

 figured in V. H. IV, 12. It is distinguished from S. Legu- 

 men Ehb. only by the val ve not being bieonstricted. 



S. Legumcn Ehb. — V. H. IV, II, Cl. 1. c. 

 Jm. 6, Ks. 15. — Rare. 



S. obtusa Lägst. — Spitsb. pl. I, 11, Cl. 1. c. 



Tlie specimens from Lule Lappmark I have seen have, 

 with one exception in Nu. 14, slightly rostrate, more narrow 

 ends than the typical form. They are identical with the 

 form from Blue Mountains, mentioned by Cleve in Syn. Nav. 

 p. 149, and seeni to graduate to S. parvula var. producta 

 Grun.. which, however, is of smaller size. — Pl. I, 6. 



Kk. 48, Nu. 18, Kv. 2(3, 2S, SL 21. — Rather rare. 



S. lapponica A. Cl. n. sp. — Pl. I, 8. 



Valve linear-elliptical, with broad, rounded ends and 

 small diaphragms, 0,035 mm. in length, 0,oo7 mm. in breadth. 

 Stauros broad, reaching to the margin. Striae slightly ra- 

 diate, delicate, more than 25 in 0,oi mm., punctate; puncta 

 forming undulating longitudinal rows. 



Nu. 14. — Very rare. 



This species has some resemblance in outline, to S. obtusa 

 Lägst, but has much finer striae, and is smaller. 



Sectio: N. Mesoleise. 



N. Semiiuilum Grun. — V. H. XIV, 8, 9. 

 Nu. 14. — Rare. 



N. Rotaeana Grun. — V. H. XIV, 17. 



Kv. 1, 32, Nu. 2, 18, 25, Jm. 6, Km. 30, Tr. 38, Ke. 49. 

 — Frequent. 



