I'LATK XLIII. 



Figures magnified 500 diameters, except the Micrn.tii-riux ami r/\/o-////.v 

 iiiniut one-half. 



PAGE. 

 Fig. 1. MICRASTERIAS RADiosA, Ralfs, Var. PUNCTATA, West, . 119 



Figs. 2, 3. XANTHIDIUM ANTIIX>PAEUM, Kg., .... 101 



Var. CANADENSE, Joshua, front 

 and end views, . . .102 



Fig. 4. CCKSMARIUM REONESI, Reinsch, .... 70 



Figs. 5, 6. STAURASTRUM ANGUL.ATUM, West, .... 132 



" 7,8. SPHAEROZOSMA SERRATUM, Bailey ; two varieties from Florida, 30 



" 9, 10, SPHAERDZOSMA (Onychonema), NORDSTEDTIANA, Turner, . 31 



" 1 1-13. COSMARIUM MENEGHINII, Breb., forma octangularis, Wille, 



Var. simplicissimum, Wille, . 70 



Fig. 14. COSMARIUM LAEVE, Rab., Var Septemtrionale, Wille, . 72A 



" 15. GONATOZYGON SEX-spiNiFERUM, Turner, . . . 172 



" 16. CALOCYLINDRUS CUCURBITA (Breb.), Kirch., . . 59 



Figs. 17, 18. COSMAHIUM (Calocylindrus) CORDANUM, Breb., . . 59 



Fig. 19. CLOSTERIUM BRAUNII, Reinsch, . . .45 



" 20. CLOSTERIUM SUBDIRECTUM, West, . . . .46 



" 21. CLOSTERIUM ROSTRATUM, Ehrb., . . . 49 



Var. brevirostratum, West , . 49 



" 22. CiX)9TERiUM LEIBLEINII, Kg., ... 49 



Var. curtum West, . . .49 



