PLATE XXXV 



Figures magnified 375 diameters. 



I IgS. 1. 2. MlCRASTEBIAS RINGENS, two form-. 



Fig. 3. Micrasterias Crux Memtenh-. 



" 4. MlCRASTEBJAe P8ETJDOFUB4 \T\, 



Pigs. 5, 6. Micbastebias fubcata, two forms, 



. 112 



111 



11 



11 





