24 ASTRID CLEVE, ON RECENT FRESHWATER DIATOMS. 



A. linearis Grun. - A. D. p. 93, V. H. XXVII, 31. 32. Striae 

 35 in 0,01 mm. 

 Kv. 9, S.-K. 7, Jm. H, Ke. 49, Gl. 43. — Not rare. n 



A. microcephala (KuTz.) Grun. — V. H. XXVII, 20 — 23. 



Km. 30. — Rare. 



A. inargiunlata Grun. — V. H. XXVII, 45, 46. 

 Kv. 28. — Rare. 



Achniinthidium (Ktixz.) Grun. 



A. flexelliim Bréb. — V. H. XXVI, 29, 30. 



Kv. 9, 16, Jm. 6, Km. 10, Tr. 38, Kk. 48, Ke. 49. — 

 Somewhat frequent. 



f. minuta A. Cl. 



Valve 0,0 1.5 mm. in length, 0,oo7 mm. in breadth. Striae 

 fine, abont 26 in 0,oi mm. 



Kv. 34. — Rare. 



Var. alpestris Br. — Diatomiste, II, 5, f. 15. 



Ks. 15. — Rare. 



A. maximum A. Cl. n. sp. — Pl. I, 22, 23. 



Valves large, the lower one 0,075 mm. in length, 0,02 

 mm. in breadth, with 23 striae in O.oi ram. The upper valve 

 0,065 mm. in length, with 26 striae in 0,oi mm. and a large, 

 rectangular central area 0,oi5 mm. in length, 0,oos mm. in 

 breadth; axial area narrow. 



Jm. 6. — Rare. 



Though not seen together, the two valves described above, 

 found in the same sample, eertainly belong to the same spe- 

 cies. They have the same ontline and about the same size 

 and number of striae. The pseudoraphe of the upper valve 

 seems to be slightly sigmoid. 



Amphora Ehb. 



A. ovalis KtJTZ. var. afflnis KiJTZ. — V. H. I, 2. 

 Kv. 32, Jm. 6, Ke. 49. — Rare. 



f. minor. — V. H. I, 45. 

 Tr. 38. — Rare. 



