PLATE VI. 



Figures magnified 500 diameters. 



Figs. 1, 2. COCCOXEMA LANCEOI.ATUM, Ehrb. Mik., 39, 3, f. 17, etc. S, B. 



D., I, p. 7.-.. W, f. 219; S.-hm. At., 10, f. 8-10. 

 Fin 1 . 3. (iraiiulcs figured, not coarse enough. 



4. COCCONEMA MEXICANUM, Ehrb. Mik., 33, 7, f. 6; Abh., 1869, 



2, 1, f. 1 ; Schm. At., 10, f. 32, 33; 71, f. 82. 

 " 5. COCCONEMA JANISCHII, Schm. At,, 10, f. 34, 35 ; 71, f. 81. Nearly 



related to C..cistula, 

 Figs. 0, 7. CYMBELLA CISTULA. Hep., Mik., 38, A., 20, f. 5 ; 37, 3, f. 3 ; .S. B. 



D., I, p. 76, 23, f. 221. Schm. At., 10, f. 1-4. 

 s, i. COCCONEMA PARVUM, W. S., S. B. D., I, p. 76, 28, f. 222; 24, f. 



222; Schui. At., 10, f. 14, 15. 

 Fig. 10. CYMBET.LA CYMBIFOKMIS, Breb. Al. Fal., p. 49, PI. 7; V. H., 2, 



f. 11. 



" ll. COCCONEMA L.ANCEOLATTJM, i'i<le f. 1-3, above. 



". ] CYMBELLA CISTULA, vide f. 6, 7. State of development, 



" 13. CYMBELLA VENTRICOSA, Ag., Consp., p. 9; K. B., p. 80, (>, f. 16; 



Schm. At,, 9, f. 32; 72, f. 11. 



"14. ( 'of! 'ox EMA LANCEOLATUM, W. S., in vegetative state, S. B. T>., 



p. 75, 23, f. 219. 



