LIST OF THE PLATES. 



IX 



PLATE LXXVII. 



Figs. 



1-4. 



Cosmarium quadri- 



farium (p. 141) 

 5-6. C. dovrense (p. 144) 

 7-11. C. isthmium (p. 145) 

 12. C. excavatum (p. 147) 

 13-14. C. subexcavatum (p. 



148) 

 15-18. C. orbiculatum (p. 



149) 



C. prxgrande (p. 150) 

 C. zonatum (p. 123) 

 G. binerve (p. 123) 



19. 



20-21. 

 22. 



PLATE LXXYIII. 



Figs. 1-10. Cosmarium ornatum 



(P- 151) 

 ,, 11-16. C. commissurale (p. 



154) 



17-18. C. dentiferum (p. 156) 

 19. C. Wittrockii (p. 179) 



PLATE LXXIX. 



Figs. 1-7. Cosmarium reniforme 



(p. 157) 



8-9. C. Turnerii (p. 160) 

 10-11. C. BreUssonii (p. 161) 



PLATE LXXX. 



1-2. Cosmarium Loyiense 



(p. 163) 

 3. C. granuLatum (p. 



164) 



4-7. C. Portianum (p. 165) 

 8-9. Zygospores which 

 have been referred 

 to C. Portianum 

 10-11. C. Portianum (p. 167) 

 12-22. C. orthostichum (p. 



167) 

 23. C. solidum (p. 170) 



PLATE LXXXI. 



gs. 1. Cosmarium Etcliacha- 

 nense (p. 170) 



PLATE LXXXI continued. 



Figs. 2-5. C. tracltypleurum (p. 



172) 

 ,, 6. C. Slewdrumense (p. 



171) 

 ,, 7-8. C. istlimoclwndrum 



(p. 173) 



,, 9. C. jenisejense (p. 175) 



10-11. C. furcatospermum (p. 



206) 

 , 12-14. C. splialerosticlium (p. 



176) 



15. C. (jeminatum (p. 177) 

 16. C.Denotarisii(p. 124) 



PLATE LXXXII. 



Figs. 1. Cosmarium tracnyder- 



mum (p. 178) 

 2-4. C. spliteroideum (p. 



178) 

 57. C. synthlibomemim (p. 



180) 



8. C. protractum (p. 181) 

 9-11. C. Corlnda (p. 183) 

 12-14. C. tiportella (p. 185) 

 15. C. re HI forme (p. 157) 

 16-17. C. Turpinii (p. 189) 



PLATE LXXXIII. 



Figs. 1-3. Cosmarium Turpinii 



(p. 189) 



,, 4-13. C. manjaritiferum (p. 

 199) 



PLATE LXXXIY. 



Figs. 1-5. Cosmarium prxmor- 



sum (p. 197) 

 ,, 6-7. C. quaternarium (p. 



204) 

 8-10. C. furcatospermum (p. 



206) 



11-12. C. Amelia (p. 205) 

 ,, 13-20' C. punctulatum (p. 

 206) 



PLATE LXXXV. 



Figs. 1-4. Cosmarium punctula- 

 tum (p. 209) 



