PLATE LXLV. 



FIGS. PAGE 



13. Cosmarium nitidnliim De Not. 1, x 500 (after 



Wolle) ; 2, x 400 (after Nordstedt) ; 3, x 520 197 

 4. C. cunaliculatum West & G. S. West. x 625 . 198 

 5-7. C. pyramidatum Breb. 5, x 500; 6, x 400; 



7, side view, x 400 (after Ralfs) . ' .199 



8. C. pyramidatum var. angustatum West & G. S. 



West, x 520. . . . 200 



9-12. C. pseudopyramidatum Lund. 9, x 400 (after 



Lundell) ; 10-12, x 520; 12, zygospore . 201 

 13. C. pseudopyramidatum var. stenonotum Nordst. 



x 400 (after Nordstedt) . . .202 



14-16. C. variolatum Lund. 14, x 400 (after Lundell) ; 



15, x 400; 16, x 520 . . . 203 



17. Euastrum pnlcliellum Breb. var. retusum West 



& G. S. West, x 400 46 



