P. T. Cleve: The Diatoms of Finland. 45 



Cymbella Ag. 



Sectio: Naviciilacece. 



C. Ehrenbergii Kiitz. — V. H. II, 1. 



Al. 59, Kon. 41. 



Foss. Ta. 94, 95. 



forma minor. Foss. Ta. 95. 



C heteropleura Ehb. — A. S. IX, 5, 6. 



This species is a characteristic northern form, found in Spits- 

 bergen and Gronland. in Dovre and in diatomaceous earth from 

 Lule Lapmark. 



Lt. 30, 32, 33, 34. 



forma minor. — Cymb. Ehrenbergii Lagst. II, 17. 



Lt. 34. 



C. cuspidata Kiitz. — V. H. II, 3. — A. S. IX, 50 to 55. 



Ab. 37. 47, 48, Lad. 85, 86, Kon. 41, Sb. 4, Lt. 30. 



Foss. Nyl. 87, Lad. 86, Sa. 88, Tb. 90, Ob. 91, 92, Lk. 

 93, 104. 



C. amphicephala Naegel. — V. H. II, 6. — C. anglica Lagst. 

 V. H. II, 4. 



There is no difference between C. amphicephala and C. an- 

 glica except in the breadth of the area around the raphe, which 

 is more perceptible in G. anglica than in the other form. 



Ab. 36, 47. 48, 49, Sb. 1, 2. 5, 7, 8, 10, 12, 15, 16, Kon. 40, 

 Lm. 39, Lt. 29. 



Foss. Ob. 92. 



C. abnormis Grim. — V. H. Ill, 8. 



Ab. 48, Kon. 41. 



Foss. Ob. 92, Lk. 104. 



C. naviculacea Grun. — CI. D. fr. Gronl. XYl. 11. 



Lim. 20. 21. 23, 24, Lt. 32, 33, 34. 



This species belongs to the northern parts of the world, lt 

 lias been found in Greenland, in Dovre and in Lule Lappmark. 



Var. incerta. — CI. 1. C. 12. 



Lt. 32. 



C. norvegica Grun. — A. S. X. 41. 



