Fresh water.
Pl. [18], Fig. 6.
CYMBELLA EHRENBERGII KUETZ.
Valve lanceolate, with ventral margin nearly straight and apices sub-rostrate; median line straight, excentric; axial area narrow; central area widened in the middle; striæ coarsely punctate.
Fresh water.
Pl. [18], Fig. 9.
CYMBELLA AFFINIS KUETZ.
Valve about three times as long as broad, strongly convex on the dorsal side and straight on the ventral; apices sub-rostrate; striæ punctate; axial area narrow, not widened in the middle; median line curved; a small or indistinct punctum on the ventral side of the median line (not shown in the figure).
Common in ponds. Abundant in East Park Reservoir.
Pl. [18], Fig. 18.