BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 21. AFD. III. N:0 2. 17 



N. bisulcatum Lagst. — Spitsb. I, 8, A. S. XLIX, 15. 17, 18. 



The valve is sometimes slightly gibbous in the middle, 

 as fig-ured in A. S. XLIX, 18. 



Kv. 1. 16, 28, 32, 34, Nu. 2, 5, 17, 18, 19, 25, 37, 41, 

 Jm. 6, Ks. 15, Km. 30, Tr. 38, S.-K. 22, 33, Na. 35. V. 12. 

 Gl. 43, Gl. I). 44. 45. Ke. 49. — Very frequent. 



Diploiieis Ehb. 



D. elliptica KtJTZ. — Cl. Syn. Nav. p. 92. 



Lengtli of the valve O.027 mm., costae 12, puncta 14 

 in 0,01 mm. 



Tr. 38. Nu. 41. Ke. 49. — Rare. 



Var. Lado^ensis Cl. — Finl. pl. II, 9. 



One specimen, 0,04.5 mm. in length, with 10 costae in 

 0,01 mm. was found in Km. 10. — Very rare. 



D. Boldtiana Cl. — Finl. pl. II. 12. N. ovalis f. minor. Gr. 

 O.-U. XXX, (U. 

 Kv. 32, Ke. 49. — Rare. 



D. ovalis HiLSE. — Cl. Finl. pl. II, 13. 



Kv. 16, 9, 26, 28, Nu. 14, Jm. 6, Km. 10, 30, Kk. 48. 

 Occurs sparingly, though widely spread. 



D. fennica Ehb. — Cl. Finl. pl. II. 11. 



A small form, connecting this species with D. Parma Cl., 

 0,04 mm. in length, with 9 costae in 0,oi mm., occurs in Ks. 15. 



Ks. 15, Ke. 49. — Rare. 



D. domblitteiisis Grun. 



Var. subconstricta A. Cl. n. var. — Pl. I, 10. 



Valve very slightly constricted in the middle, 0,0 5 5 mm. 

 in length, 0,oi8 mm. in breadth. Costae 11 in 0,oi mm., 

 alternating with coarse, distant (8 in 0,ui mm.) alveoli. 



Ke. 49. — Very rare. 



CymbeHji Ag. 



C. microcephala Grux. — V. H. VIII, 36—39. 

 Jm. 6. — Rare. 



C. Cesatii Rabh. — A. S. LXXI. 48, 49. 



Kv. 1, Ks. 15, Jm. 6. Tr. 38, S.-K. 7, Kk. 48. — Some- 

 what frequent. 



2 



