PLATE XLIV. 



Fig. I. Cosmayium intermedium Delp. 



2. Euastrum elegans (Breb.) Kuetz. 



3. Penium digitus (Ehrenb.) Breb. 



4. Cosmarium latum Breb. 



5. Staurastrum dejcctum Br^b. a, b and r. 



6. Cosmarium sphalerostichum Nordst. 



7. Micrastcrias truncata (Corda) Ralfs. 



8. Cosmarium phaseolus Breb. 



9. Cosmarium undulatum Corda. 



11. Micrastcrias denticulata (Brdb.) Ralfs. 



12. Cosmarium ftachydcrmum Lund. 



13. Tetmcmorus brebissonii {^lenegh.) Ralfs. 



14. Arthrodesmus cotivergeiis Ehrenb. 



15. Cosmariu77i blyttii Wille. 



16. Cos7narium contractum Kirch. 



17. " kitcheliiW oWe. 



18. Xanthidium armatum (Breb.) Ralfs. 



19. Cosmarium inetiegkinii brautiii {'R.e'wxsch.) Ilansg. 



20. Pleurotictiiopsis debaryi (Archer) Lund. 



21. Cosmarium tumidum Lund. 



22. " A-rt//5/V Brdb. 



23. Micrasterias kitcheliiV\'o\\c. 



24. Euastrutn didelta (Turp.) Ralfs. 



25. " e/e^a«5 (Breb.) Kuetz. 



26. " " '■ Two forms. 



27. Micrasterias oscitans j)innatijida {Y^ueiz.^ Rabenh. 



28. Cosmarium holmiense Lund. 



29. Staurastrum ravenelii 'Wood, a, front view : ^, end view. 



30. Euastrum elegatts, large form. 



31. Micrasterias Jimbriata elephanta Wolle. 



(450) 



