A. CLEVE-EULER,DIAT. FLORA OF FINLAND. 25 



Naviculae Punctatae Cl. 



Navicula glacialis Cl. — Syn. Xav. D. II. Tab. 1, f. 28. 

 Foss.: Kk. Knjäsha, rare. 



Distr. {niar.): Greenland, East Arctic Sea, Cape Horn, 

 Antarctis. 



Navicula glacialis Cl. var. septentrionalis Cl. — A. S. 

 Atl. Tab. 6, f. 37. 



Foss.: Kk. Knjäsha, more frequent than the main form. 

 Distr. {mar.): West and East Arctic Sea, Cape Horn. 



Navicula humerosa Bréb. var. densestriata n. var. 



Like the type in outline and dimensions, but with closer, 

 finely punctate striae, 15 in 10 <^. Cleve states 9 — 10 in 10 u. 

 for the typical form. 



Foss.: Sat. Panelia {brack, w.). 



Navicula latissima Greg. var. grandis n. var. — PL 1, 

 f. 21. 



Valve very large, elliptic-lanceolate with subrostrate ends, 

 150—170 |i in length, 64—68 u. in breadth. Striae about 8 

 in 10 a, as in the main form. 



Foss.: Kk. Knjäsha, rare (mar.). 



Of this very conspicuous variety, I have .seen only a few, 

 damaged valves. It depasses in length the largest form of 

 A', latissima hitherto known, viz. the var. elongata, found by 

 Pantocsek in Hungarian fossil strata. The striae are also 

 more distant than in this variety. 



Naviculae Lyratae Cl. 



Navicula Hennedyi W. Sm. var. luxuösa n. var. — PI. 

 1, f. 22. 



Valve elliptical, 85—100 a in length, 50—55 a in breadth. 

 Lateral areas moderately broad, semilanceolate, not or very 

 shghtly narrowed in the middle. Striae 6 — 7,5 in 10 a at the 

 outer margin, 10—11 at the inner margin, composed of small 

 puncta. Axial striae 10 in 10 a. 



