22 ASTRID CLEVE, ON RECENT FRESHWATER DIATOMS. 



Var. cymbelloideis GrRUN. — Pl. I, 16. 

 Ks. 20, Kv. 32. — Rare. 



G. subclavatiim Grun. - V. H. XXIII. 36—43, Cl. 1. c. p. 183. 



Var. Mnstela Ehb. — V. H. XXIV, 4. 



Kv. 9, S.-K. 7, Nu. 17, 41, Ll. 21. — Not rare. 



Var. moiitaua Schum. — V. H. XXIII, 35, 36. 



Kv. 9, 16, 32, Nu. 17, 41, V. 12, Tr. 38, S.-K. 7, Jra. 6, 

 Km. 10, 30, Ll. 21, Ks. 20, Gl. 44. — Freqiient. 

 f. suecica Grun. — V. H. XXIII, 32. 



Ks. 15. — Rare. 



f. media Grun. — V. H. XXIII, 37. 



Kv. 34, Nu. 18. — Rare. 



G. Lagerheimii A. Cl. n. sp. — Pl. I, 15. 



Valve almost symmetrical, linear, biconstricted, witli 

 acute ends, 0,04 5 mm. in length, 0,oo.5 mm. in breadtli. Striae 

 slightly radiate in the middle, 15 in 0,oi mm., somewhat 

 more distant in the middle of the valve.. 



Nu. 18, 41, Jm. 31. — Rare. 



This species is probably akin to G. subclavatum var. 

 montana Schum. 



G. acuminatuiu Ehb. — V. H. XXIII, 16, Cl. 1. c. p. 184. 

 Kv. 1, 9, 26, S.-K. 7, Ks. 15, 20, Jm. 31, Tr. 38, Ke. 49. 



— Rather frequent. 



f. Brébissonii KtJTZ. — V. H. XXIII, 23, 24. 

 Kv. 26, 32, Jm. 6, Ks. 15, 20, Km. 10, S.-K. 7, Ke. 49. 



— Somewhat frequent. 



f. coronata Ehb. — V. H. XXIII, 15. 

 Kv. 32, Jm. 6, S.-K. 7, Ks. 15, Km. 30. — Not rare. 



f. hastata A. Cl. — Pl. I, 17. 

 Valve with cuneate apex (like that of G. acuminatum f. 

 trigonocephala Ehb.) abruptly constricted below, not gibbous 

 in the middle, 0,o3 7 mm. in length. Striae 13 in 0,oi mm. 

 Tr. 38. — Rare. 



Var. elongata W. Sm. — V. H. XXIII, 22. 

 K v. 1, 26, 34, Ks. 15, 20. — Somewhat rare. 



G. constrictiini Ehb. — V. H. XXIII, 6, Cl. 1. c. p. 186. 



Kv. '2ii, 32, Jm. 6, V. 12, S.-K. 7, Ks. 15. — Rather 

 frequent. 



