PLATE XXI 



Fipiirf- magnified 500 diameters. 



P\r,r. 



Fig. 1. Xanthtdium himatum, from Mounl Everett, Mm.. . 92 



! tgs. 'J. 3. more common Forms and sizes, 



Fig. I tram iew "t .> xeraicell, . '.'J 



Figs. 5 7. Xanthjdh m crihtati ic three forms, . . 93 



I'ii: - " ' end view, .... 93 



Figs '.'.Hi. Xanthomum isteptx'm, two farms, . . . 93 



1 !- 1 1. " lateral riew, .... '.:; 



