12 ASTRID CLEVE, ON RECENT FRESHWATER DIATOMS. 



N. rostellata KtJTZ. — V. H. VII, 24. 

 Ke. 49. — Rare. 



N. tnscula (Ehb.) Grun. — V. H. X, 14. 

 Ke. 49. — Very rare. 



Sectio: N. punetatse. 



N. lacustris Grun. — Cl. Finl. pl. II, 14, p. 34. 

 Km. 30, Kv. 32. — Rare. 



Sectio: N. Decussatse. 



N. Placenta (Ehb.) Lewis. — Cl. & Gr. A. I). III, 60. 

 Ky. 1, 2Q, S.-K. 22. — Rare. 



Sectio: N. Heterostiehse. 



N. cocconeiforiiiis Grég. — V. H. XIV, 1. 



Kv. 28, Nu. 2, 14, 17, 37, Km. 30. — Somewhat rare. 



N. scutiforiiiis Grun. — A. S. LXX, Q2. 

 K v. 32, Km. 30. — Rare. 



Sectio: N. Microstigmaticae (Stauroneis). 



S. aiiceps (Ehb.) — Cl. Sjn. Nav., p. 147. 



Var. hyalina Br. & Pér. — Hér. Auv. pl. III, 19. 



Kv. 32, Nu. 2, 17, 18. — Rare. 



Var. linearis Grun. — V. H. IV, 8. 



Km. 30, Tr. 38, Gl. D. 44, Ke. 49. — Not rare. 



A^ar. elongata Cl. — ]. c. p. 148. 



Jm. 6, Gl. 43. - Rare. 



Var. amphicephala KtJTZ. — V. H. IV, 4, 5. 



Kv. 32, S.-K. 7, 33, Tr. 38, V. 12, Gl. D. 45. — Some- 

 what frequent. 



Var. leiostaiirou A. Cl. ii. var. — Pl. I, 7. 



I ref er to tliis new variety a specimen O, o 7 mm. in length, 

 0,019 mm. in breadth, witli lanceolate valve and rostrate ends, 

 occuring in Kv. 26. Striae 18 to 19 in 0,oi mm., distinctly 

 punctate; pnncta 24 in 0,oi mm. Stauros not reaching to the 

 margin. 



Kv. 26. — Rare. 



