PLATE 25 

 FIG. PAGE 



NAVICULA 



1 Navicula tumida (Breb.) Cl 99 



2 Navicula brasiliensis var. bicuneata Cl. forma constricta. 92 



3 Navicula delawarensis Grun 92 



4-6 Navicula pusilla Wm. Sm 91 



5 Navicula humerosa Brdb 91 



7 Navicula spectabilis var. emarginata Cl 94 



8 Navicula pusilla var. subcapitata n. var 91 



9 Navicula punctulata Wm. Sm 92 



10 Navicula lyra Ehr 93 



1 1 Navicula hennedyi var. manca A. S 93 



12 Navicula hennedyi Wm. Sm 93 



13 Navicula lyra var. dilatata A. S 93 



14 Navicula yarrensis Grun 101 



15 Navicula yarrensis Grun. (smaller form) 101 



16 Navicula yarrensis Grun. var.? 101 



