PLATE 20 

 FIG. PAGE 



DICTYONEIS 



1 Dictyoneis marginata var. maxima n. var 79 



2 Dictyoneis marginata var. commutata Cleve 79 



3 Dictyoneis marginata var. typica Cleve 78 



DIPLONEIS 



4 Diploncis crabro var. pandura (Br6b.) Cl 85 



6 Diploneis campylodiscus (Grun. )C1 86 



7-8 Diploneis gruendleri (A. S.) Cl 85 



9 Diploneis crabro Ehr. var.? 85 



10 Diploneis excentrica n. sp 85 



11 Diploneis fusca var. delicata (A. S.) Cl 85 



12 Diploneis puella (Schum.) Cl 85 



13 Diploneis crabro var. pandurella Cl.? 85 



14 Diploneis elliptica (Kuetz.) Cl 84 



15 Diploneis crabro var. expleta (A. S.) Cl 85 



10 Diploneis gemmata (Grev.) Cl 86 



17 Diploneis smithii (Br6b.) Cl 84 



NAVICULA 



5 Navicula lyra Ehr. var.? 93 



