PLATE 7 

 FIG. PAGE 



BIDDULPHIA 



1-2-3-4 Biddulphia biddulphiana (Smith) .... 31 



5 Biddulphia rhombus (Ehr.) Wm. Sm 32 



6 Biddulphia granulata Roper. . . 



7 Biddulphia turgida (Ehr.) Wm. Sm 32 



8 Biddulphia smithii (Ralfs) V. H 32 



9 Biddulphia \scvis Ehr 



10 Biddulphia la-vis Ehr. Sporangial frustules (260 diam.). . . 33 



EUNOTOGRAMMA 



11 Eunotogramma ktve Grun 



