PLATE LXV. 



FIGS. PAGE 



1-2. Cosmarium Holmiense Lund. 1, x 400 (after 



Lundell) ; 2, semicell, x 400 . . 1 



3-5. C. Holmiense var. integrum Lund. 3 and 4, x 



400 ; 5, x 400 (after Nordstedt) . . 2 



6. C. Holmiense var. attenuatum Gutw. x 400 . 4 

 7. C. Holmiense var. undatum West, x 400 . 4 

 8-9. C. cymatopleurum Nordst. 8, x 400 (after 

 Nordstedt) ; 9, form with produced apices, 

 approaching var. Archerii, x 520 . . 5 



10. C. rymatopleurum var. Archerii (Rov & Biss.) 

 West & G. S. West. x 400 (after Roy & 

 Bissett) . . . .6 



11-12. C. cymatopleurum var. tyrolicum Nordst. !!_, 



x 400 (after Nordstedt) ; 12, x 400 . 6 



13-14. C. cibtusatum Schmidle. ]3, x about 625 



(after Schmidle) ; 14, x 520 . 7 



15. C. obtusatum var. Beanlandii West & G. S. West. 



x 520 8 



