46 Acta Societatis pro Fauna et Flora fennica, VIII, n. 2. 



Lira. 23, 26. 



C. subsequalis Grun. — V. H., Ill, 2 Suppl. A. 1. — C. obtusa 

 A. S. IX, 41 to 45. 



Al. 59, Ab. 37, 50, Lt. 28, 31, Lim. 21, 23, 24, 26. 



Foss. Ob. 92, Lk. 93. 



C. sequalis W. Sm. — A. S. IX, 69; LXXI, 50. — Navic. 

 inaequilatera Lagst. II, 10. 



Ab. 59, Kon. 42, Lim. 23. 



C. Cesati Rabh. — Navic. Cesati V. H. VIII, 35. 



Lim. 22, 23, 26. 



C. borealis Gl. n. sp. — Valve slightly asymmetric, slender, 

 8 to 9 times longer than broad, gradually tapering from the 

 middle to the ends. Striae strong, 10 in 0,oi m. m., on the middle 

 of the valve, about 13 to 14 at the ends, finely transversaly line- 

 ate. Area narrow. Length of valve 0,0 6 to 0,07 m. m., breadth 

 0,007 to 0,009 m. m. 



PI. II, fig. 19. 



Lim. 25. 



The lineation of the striae is seen only with great difficulty 

 and I am indebted to Prof. Van Heurck in helping me to resolve 

 it. The species is evidently akin to Naviculae radiosae. 



Sectio: Co cc on em a. 



C. gastroides Kiitz. — V. H. II, 8—9. 



Al. 59, Ab. 36, 37, 46, 47, Lad. 63, 85, 86, Kon. 40, 41, 

 Sb. 8, 10, 16, Lim. 21, 23, 24, 26, Lt. 28, 31. 



Foss. Nyl. 87, Nyl. B. 102, Ta. 97, Tb. 90, Ob. 92, Lk. 93, 

 104. 



C. lanceolata Ehb. — V. H. II, 7. 



Ab. 36, 38, 44, 45, 47, 50, Lad. 85, 86, Kon. 41, 43. 



Foss. Ta. 94, Ob. 92, Lk. 104. 



C. Boeckii Kiitz. 



Sinf. Nyl. (Dannf.) 



C. Cistula Hempr. — V. H. II, 12. 



Ab. 38, 45, 50, Mb. Ab. 100, Sinf. Nyl. (Dannf.). Lad. 85, 

 86, Kon. 41, 43, Sb. 4, 18, Lim. 23. 



Foss. Ta. 96, Ob. 92, Lk. 104. 



