PLATK XXVI 



FIGURE 98. Oscillatoria terebriformis Ag. forma tennis, x 500. 

 FIGURES 99-101. Oscillatoria priestleyi sp. n. 99, x 500 ; 100 and 101, x 1000. 

 FIGURE 102. Oscillatoria amphibia Ag. var. robusta var. n. a, x 500 ; b, x looo. 

 FIGURES 103-106. Asterocystis antarctica sp. n. 103-105, x 500; 106, x 1000. 

 FIGURES 107-114. Microcystis chroococcoidea sp. n. x 500. 



FIGURES 115-120. Tropidoneis laivissima sp. n. 115-118 and 120, x 500; 119, 

 x 1000. Fig. 117 is one of the deformed valves not infrequent in Clear Lake. 

 Fig. 115 is the girdle view, and Fig. 120 the end view of a frustule. 

 FIGURES 121-124. Navicula muticopsis V. Heurck. x 1500. 

 FIGURE 125. Navicula glaberrima sp. n. x 1000. 



FIGURES 126-127. Achnanthes brevipes Ag. var. intermedia (Kiitz.) Clove, x 1500. 

 FIGURE 128. Fragilaria tenuicollis Heib. var. antarctica var. n. x 1500. 

 FIGURE 129. Navicula murrayi sp. n. x 1500. 

 FIGURE 130. Navicula murrayi var. elegans var. n. x 1500. 

 FIGURE 131. Navicula muticopsiforme sp. n. x 1500. 

 FIGURE 132. Navicula peraustralis sp. n. x 1800. 

 FIGURES 133-134. Navicula cymatopleura sp. n. x 1500. 

 FIGURE 135. Navicula globiceps Greg, x 1500. 

 FIGURES 136-138. Navicula shackletoni sp. n. x 1500. 

 FIGURES 139-141. Navicula shackletoni var. pellucida var. n. x 1500. 



