PLATE XLIII.^ 



Fig. I. Cosmarium conspersum Ralfs. 



2. " ccelatum Ralfs. 



3. " ornatum Ralfs. 



4. Euastriim crassum (Bieb.) Kuetz. 



5. Cosmarium fseudotaxichondricm Nordst. 



6. " parvulnm Breb. 

 7- " hammeri Reinsch. 



8. " fi'ranatuvt Br^b. 



9. Euastrum verrticosum Ehrenb. 



10. Cosmarium ochtodes Nordst. 



11. " (5t>//-_y//5 Menegh. 



12. " portianum nephroideum Wittr. Front view. 



13. " " " " End view. 



14. Closterium parvulum Naeg. 



15. " venus Kuetz. 



16. Staurastrum echinatum Pec ten (Perty) Rab. 



17. Cosmarium dcpressum (Naeg.) Lund. 



18. " pulckerrimum Nordst. 



19. " " " From Kukak Bay. 



20. " subcrcnatum Ilantzsch. 



21. " pseudogranatum Nordst. 



22. " quadrifarium Lund. 



23. Staurastrujn polytnorphutn Breb. End view. 



24. " " " Front view. 



25. Micrasterias rotata (Grev.) Ralfs. 



26. Cosmarium broomei \iir. Thwaites. 



27. Closterium acerosum (Schrank), Ehrenb. 



28. Cosmarium bioculatum Breb. 



29. MesotiV)iium braunii De Bary. 



30. Disphinctium connatum (Breb.) De Bary. 



31. Staurastrum calyxoides Wolle. 



32. Euastrum affine Ralfs. 



33. Cosmarium constrictum Delp. Side view. 



34. " " " Front view. 



35. " (^roo;;??/ Thwaites, End view. 



36. " " " Front view. 



37. Euastrum oblongum (Grev.) Ralfs. 



38. Xanthidium antilop(eu7n (Breb.) Kuetz. 



39. Cosmarium sexangulare Lund. 



40. " pyramidatum Breb. 



' Plates xliii-lxii are from drawings by Eva M. Saunders, except for plates 

 xlvi, figs. I and 2, which were drawn by Edna L. Hyatt. 



(448) 



