A. CLEVE-EÜLER, DIÄT. FLORA OF FINLAND. 31 



Of this variety, I have seen only the specimen, dehneated 

 in fig. 34. It has about the same outline as Pinnularia In- 

 tegra G RUN. 



Majores Cl. 



Pinnularia major Kütz. var. linearis Cl. Syn. Nav. D. 

 U, p. 89. Syn. Pinnularia major W. Sm. B. D. Tab. 18, f. 162. 

 Foss,: Ob. Pudasjärvi (Cleve, 1. c). 

 Distr. {jresh tu.): Scandinavia; ubiquist. 



Pinnularia viridis Nitzsch var. fallax Cl. Syn. Nav. D. 

 II. p. 91. — Syn. Naviciila semicruciata A. S. Atl. Tab. 44, 

 f. 43; Tab. 43, f. 24. 



Ladoga. Foss.: Finl., in samples from the Geol. Commis- 

 sion (locality unknown). 



Distr. {fresh w.): Sweden, Continent of Europe, S. Ame- 

 rica, Australia. 



Pinnularia viridis Nitzsch var. producta n. var. — PI. 

 2, f. 36. 



Valve linear, suddenly contracted to the rostrate ends; 

 90 [J. in length, 15 [>. in breadth. Striae 9 in 10 [j.. 



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



A rostrate form of the var. intermedia Cl., probably akin 

 to Pinnularia Esox* 



Pinnularia cuneata (0str.) var. constricta n. var. — 

 PI. 2, f. 37 a, b. 



Valve linear, somewhat constricted in the middle, with 

 cuneate ends. Length 100—145 [j-, breadth 25 "J.. Axial area 

 broad, slightly widened in the middle. Striae coarse, sligthtly 

 divergent in the middle and convergent at the ends, 6,5 in 

 10 [J.. Median line complex. Striae sometimes unilaterally 

 interrupted in the middle. 



Foss.: Ab. Hindersmossen (fresh iv.). 



I have been hesitating about the place of this interesting 

 form, that does not seem akin to any recent Fennoscandian 

 Pinnularia, if not perhaps to P. streptoraphe var. minor in 

 Cleve's Diat. of Finl. Tab. 1, f. 2. In outline and sculpture 

 there is a great resemblance with Navicula hevesensis Pant. 

 and Pinnularia Floridae Brun, but both of these are smaller 



