PLATE XVI. 



Figures magnified 500 diameters. 



Page. 

 Figs. 1, 2. CosMARiUM MAKGARiTiFERUM ; normal, front view, and empty 



semi-cells, transverse view, 81 



Fig. 3. ■• " zygospore with the empty semi- 



cells, . . . .81 



"■ 4. COSMARIDM PUNCTULATUM, . . . ■ . 81 



Figs. 5-7. CosMARiUM BoTBYTis, three forms. (Compare Plate XXVII, 



fig. 27), . . 81 



" 8, 9. CoSMABiUM OVALE, Smaller and larger form, . . 62 



" 10, 11. CoSMABiUM Bbebissonii, two forms, . . . 82 



Fig. 12. COSMABIUM INTEKMIDIUM, . ... 83 



" 13. COSMABIDM TETBOPTHALMUM, . ... 82 



" 14. CosMABiUM liATTJM, ends too convex for typical form, 84 



" 15. COSHAEIUM DBNTATUM, . . . . . .83 



