98 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I49 



Plate 8. Meniscotherium femur and patella from the early Eocene of Wyoming 



Figs. 1, 2. Meniscotherium robustum Thorpe. 1, Right femur (U.S.N.M. 

 18283), posterior, distal, medial, proximal, and anterior views. 2, Patella 

 (U.S.N.M. 18283), anterior view. Natural size. La Barge, Knight member, 

 Wasatch formation, Green River Basin, Wyo. 



Plate 9. Meniscotherium tibiae and fibula from the early Eocene of Wyoming 



Fig. 1. Meniscotherium robustum Thorpe. Right tibia and fibula U.S.N.M. 

 18283), proximal, lateral, anterior, and distal views. Natural size. La 

 Barge, Knight member, Wasatch formation, Green River Basin, Wyo. 



Fig. 2. Meniscotherium, cf. chamense Cope. Right tibia (U.S.N.M. 22675, 

 restored from U.S.N.M.: 22672), anterior and lateral views. Natural 

 size. New Fork member, Wasatch formation, Green River Basin, Wyo. 



Plate 10. Meniscotherium pedes from the early Eocene 



Figs. 1^4. Meniscotherium chamense Cope. 1, Left navicular (U.S.N.M. 

 22918) and left cuboid (Y.P.M. 20950), proximal and distal views, and 

 lateral view of navicular. lJ^X natural size. Navicular from New Fork 

 member, Wasatch formation, Green River Basin, Wyo. Cuboid from 

 San Jose formation, San Juan Basin, N. Mex. 2, Left pes (U.S.N.M. 

 22435, with cuboid restored from Y.P.M. 20950), medial and dorsal views. 

 Natural size. New Fork member, Wasatch formation, Green River Basin, 

 Wyo. (except cuboid from San Juan Basin). 3, Metatarsals I-V (I, 

 V, U.S.N.M. 22918; II, Y.P.M. 20949; III, Y.P.M. 20948; IV, Y.P.M. 

 10559), proximal view of bases l l AX. natural size. Metatarsals I and 

 V from New Form member, Wasatch formation, Green River Basin, 

 Wyo. Metatarsals II-IV from San Jose formation, San Juan Basin, N. 

 Mex. 4, Left calcaneum and right astragalus (U.S.N.M. 22918), dorsal 

 and ventral views respectively. l^X natural size. New Fork member, 

 Wasatch formation, Green River Basin, Wyo. 



Figs. 5-8. Meniscotherium robustum Thorpe. 5, Left external cuneiform 

 U.S.N.M. 18283), proximal, medial, and distal views. VAX natural 

 size. 6, Left pes (U.S.N.M. 18282, lacking 1st and 5th digits and distal 

 phalanges), dorsal view. Natural size. 7, Second phalanx, 3d(?) digit 

 (U.S.N.M. 18283, dorsal and lateral views. V/2X natural size. 8, Distal 

 phalanx, 3d(?) digit (U.S.N.M. 18283), dorsal, lateral and ventral views. 

 V/2X natural size. La Barge, Knight member, Wasatch formation, Green 

 River Basin, Wyo. 



Plate 11. Restoration of Meniscotherium 



Restoration of Meniscotherium by the artist Walter Ferguson based on a 

 composite skeleton from the San Juan Basin of New Mexico. Photo- 

 graph by courtesy of the American Museum of Natural History. 



