A. CLEVE-EULER, DIAT. FLORA OF FINLAND, 27 



Naviculae Laevistritatae Cl. 



Navicula angulosa Greg. — Donk. B. D. Tab. 4, f. 4. 

 Syn. Navicula solida Cl. A, D. Tab. 1, f. 24, — Icon, nost. 

 PI. 1, f. 23. 



Foss. : Kk, Knjäsha, rare. 



Distr. (mar.): Finmark, North Sea, Mediterranean, 



In Cleve's Synopsis, Navicula angulosa is considered to 

 be a mere variety of N. palpebralis, but N. solida to be a 

 distinct species, recognised at the median striae being alter- 

 nately longer and shorter. As Donkin's original figure of 

 N. angulosa just shows that kind of striation, I think Gre- 

 gory's and Cleve's forms must be united and specifically 

 distinguished from Navicula palj^ebralis. The fossil specimen 

 I have seen being distinctly apiculate, I have drawn it in 

 f, 23. 



Pinimlaria Ehb, 

 Capitatae Cl. 



Pinnularia interrupta W, Sm, var, amphirhynchus n, var. 



— PI. 1, f. 24. 



Valve with protracted, narrow, rostrate, not capitate 

 ends, in other respects as the f. biceps. Length 63 u., breadth 

 15 |J., striae 10 in 10 [J.. 



Foss.: Ab. Hindersmossen, rare {fresh iv.). 



Pinnularia mesolepta Ehb. var. angusta Cl, Syn, Nav. 

 D, II, p. 76. A, S, Atl. Tab, 45, f, 62, 

 Foss,: x4.b. Hindersmossen, 

 Distr. {fresh w.): Sweden, Danmark, Germany, America. 



Divergentes Cl. 

 Pinnularia Legumen Ehb. var. longa n. var, — PI, 1, f. 25. 

 Valve slender, lanceolate-linear, slightly triundulate; 100 



— 120 [1 in length, 17 ^). in breadth. Ends broad, subcapitate. 

 Axial area rather broad, somewhat dilated in the middle. 



