3() ASTRID CLEVE, ON RECENT FRESHWATER DIATOMS. 



F. minutissima Grun. — V. H. XLV, 14. 



Tr. 38. — Rare. 



F. intermedia Grun. — V. H. XLV, 10. 



The specimens from Lule Lappmark have 16 striae in 

 0,0 1 mm. Grunow's figure in V. H. 1. c. lias 13 in 0,oi mm. 



Km. 30. — Rare. 



F. lappoiiica Grun. — V. H. XLV, 35. 



Valve 0,035 mm. in length, 0,0()7 mm. in breadth. Striae 

 6 in 0,0 1 mm. 



Tr. 38. — Rare. 



Var. miiiuta A. Cl. n. var. - Pl. I, 40. 



Valve smaller, 0,oi mm. in length, 0,oo4 mm. in breadtli. 

 Striae closer, 10 in 0,oi mm. 



Ke. 49. — Rare. 



Biatoma De Cand. 



D. hiemale (Lyngb.) Heiberg. — V. H. LI. 1, 2. 

 Tr. 38. — Rare. 

 Var. mesodon KtJTZ. — V. H. LI. 3, 4. 



Nu. 2, 18, 25, Km. 10, Kv. K), Tr. 38, Gl. D. 44, 45. — 

 Frequent. 



Meridion Ag. 



M. circulare C. Ag. — V. H. LI. 10—12. 



Kv. 16, 32, Nu. 17, 18, Km. 10, Tr. 38, Gl. D. 44, 45. — 

 Frequent. 



Var. constricta Ralps. — V. H. LI, 14, 15. 



Nu. 2, 18, V. 12, Gl. D. 44. — Somewhat rare. 



Tetracyclus (Ralfs.) Grun. 



T. lacustris Ralfs. — W. Sm. B. D. XXXIX. 308. 



Kv. 1, 32, 34, Jm. 6, Ks. 15, 20, LI. 21, Km. 30, Tr. 38, 

 Nu. 41. — Frequent. 



Var. euiarginata Ralfs. 



Kv. 1, 32, 34, Nu. 9. 41, LI. 21, Km. 30, Tr. 38. — Some- 

 what frequent. 



