FIGURES 33–37 SEM. Williamsella angusta. Internal views showing valves from five specimens. Fig. 33 in New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah

FIGURES 33–37 SEM. Williamsella angusta. Internal views showing valves from five specimens. Fig. 33, Full valve view of a large specimen with subcapitate apices. Fig. 34, Apex showing the raised rimoportula. Fig. 35, Apex showing the linear opening of the rimoportula. Fig. 36, An apex without a rimoportula. Fig. 37, Unpaired striae and shortened striae near the valve center. Scale bars: Fig. 33: 10 µm; Figs. 34–37: 0.5 µm.