PLATE L XXX VI. 



Page. 



Fig. 1. Populus balsamoides? Gopp. Fossil Forest 696 



2. Populus? vivaria n. sp. Fossil Forest 696 



3. Cokylus macquarkyi Heer. Fossil Forest 699 



4,5. Betula iddingsi n. sp. Yellowstone River below Elk Creek 698 



6-8. Castanea pulchella n. sp. Fossil Forest ■. . 702 



812 



