Clarence J. Elmore 



• PLATE 10 



Page 



Fig. 368. Navicula giiatanialcnsis CI. and Grun 84 



Figs. 3,69-2,73. N. fidva (Nitz.) Ehr 84 



Figs. ZlA-yjl- ^- ambigua Ehr 85 



Figs. 378, 382. A^. fuha in sporangial form 86 



Fig. 379. A^. fuha (Nitz.) Ehr 84 



Fig. 380. A'', fuha dividing 84 



Figs. 381, 383-386. A^. ambigua Ehr 85 



Fig. 387. A'', mucronata n. sp 85 



Fig. 388. N. ambigua, sporangial form 86 



Fig. 389. A^, sp., sporangial form 86 



