PLATE CI. 



Fig. 1. Akalia wiiioirni n. sp. Fossil Forest 744 



2. CissiTES HACUKi n. sp. Fossil Forest 741 



3. Akalia skrrulata u. sj). Yellowatouo River below Elk Creek 747 



4,5. ZizYi'HUS .SERUULATA Ward. Yellowstone River below Elk Creek 740 



6. Credxeuia? PACiiYi'iiYLLA n. sp. Yellowstone Kiver below Elk Creek 742 



7. Paiitrus CDLO.MBi Heer. Head of Tower Creek 740 



842 



