SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 146, NO. 7, PLATE 1 



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Achnanthes subhyalina, sp. nov. 



(i) Single valves (girdle view) ; {2} complete frustule (girdle view) ; (3) 

 valves (face viewO ; (4) frustule (girdle view) with extra attached valve, 

 sometimes seen; (5) abnormal valves; (6) end view of one frustule; (7) 

 frustules (valve view) with chromatophores alternately arranged; {8) same, 

 with chromatophores oppositely arranged; (9) spherical "resting" spore bodies 

 with peripheral chromatin masses; {10) same completely filled by chromatin 

 masses. 



