P. T. Cleve: The Diatoms of Finland. 29 



PL 1, fig. 6. 



Kon. 41 (rare). 



P. molaris Grun. — Nav. appendiculata in V. H. VI. 18. 19. 

 — Nav. macra A. S. XLIV, 54. 



Sb. 3, 4. 



P. leptosoma Grun. — V. H. XII, 29. 



One specimen from Finland measures 0,0 4-3 m. m. in length 

 and 0,0 5 m. m. in breadth. The striae are 18 in 0,oi m. m. in 

 the middle and 20 near the ends of the valve. 



Ab. 36, Lim. 21. 



P. Braunii Grun. — V. H. VI, 21. 



Sb. 10. 



P. Hilseana Janich. — V. H. Suppl. A. 11. — Nav. subcapi- 

 tata Greg. V. H. VI, 22. — Nav. gracillima A. S. XLV, 62, 63. — 

 Nav. termitina A. S. XLV, 64. 



In Van Heurcks Synopsis Nav. Hilseana and N. subcapitata 

 are described as different species. The principal distinction is 

 that the stria? of Nav. subcapitata do not reach the raphe, which 

 is the case with the striae of Nav. Hilseana. The distinction is 

 an exceedingly delicate one, and I think it advisable to unite the 

 two forms. 



Al. 60, Ab. 49, 52, Sb. 1, 2, 8, 10, 12, 13, 15, Lm. 39, Lt. 

 30, Lim. 20, 21. 



P. divergentissima Grun. — V. H. VI, 32. 



Ab. 36, Lt. 29, 30, 33, Lim. 20, 21, 2Q. 



Foss. NyL 87. 



P. mesolepta Ehb. — V. H. VI. 10—13, 15. — A. S. XLV, 

 52, 53, 71, 78. — Nav. nodulosa Kutz. — Finn, interrupta YV. Sm. 



Ab. 36, 4l». Sb. 1, 2, 3, 4, 5, 7, 12, 15. 



Foss. Ob. 92, Lk. 104. 



Var. Termes Ehb. 



Sinf. Nyl. (forma contracta according to Dannf.), Sb. 1, 2. 

 Lim. 23, Lt. 30. 



Foss. NyL 87. 



Var. crassior Grun. — Nav. globiceps var. crassior Grun. in 

 CI. Gr. A. D. I, 13. 



Al. 58 (brackish water). 



P. nodosa Kutz. — A. S. XLV, 56, 57, 58 



