PLATE XL VIII. 



Figures magnified 500 diameters 



Page. 



Figs. 1, 2. STAtrSASTEUM WOLLEANUM, . ... 163 



" 3, 4. Staueastrum cobntjtum, . .158 



" 5, 6. Staiteastktjm bacillabe, . . 132 



" 7, 8. Staurastkum Mutnesotense, . . . . 156 



" 9, 10. slatjrastrrm pseudocrenatum, . . . 139 



" 11-13. Stadrastrum Mutneapoliense, . . 141 



" 14, 15. Staurastrom oalyxoides, . . . 158 



" 16, 17. Statjrastrum erasdm, . . 139 



" 18-20. cosmarium ixflatum, . . 67 



" 21, 22. Statjrastrum xiPHiDioPHORtJM, 155 



" 23-25. COSMARITTM NORDSTEDTU, 80 



" 26, 27. CoSMARIUM SPHALEROSTICHUM, . 76 



" 28, 29. CosMARiDM BEATTNn, forma major, 72a 



" 30, 31. COSMARTDM Sendtnerianum, 72a 



Fig. 32. CosMARiTjM perforatum, 65 



Figs. 33, 34. Cosmarium lobatulum, . . 66 



" 35, 36. Cosmarium loeve, 72a 



Fig. 37. Cosmarium circulabe, . . 68 



