w
Fig. 11. Gyrosigma Hippocampa; a, front view ; Z», side
view. — Fig. 12. Nitzschia elonyata; a, front view; b, side
view. — Fig. 13. Navicula inequalis. — Fig. 14. Navicula
lanceolata. — Fig. 15, Surirella Jenneri: a, front view;
b, end view. — Fig. 16. Navicula.
P L A T F C H I.
Figs. 1 and 2. Zygnema insigne.— Fig. 3. Coccochloris cysti-
fe ra .—Fig. 4. Coccochloris variabilis.—Fig, 5. Coccochloris
obscura.
'll/I ,//•• Si-ii/iii.t .Ml/
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