NO. 2 A STUDY OF MENISCOTHERIUM — GAZIN 97 



Fig. 3. M eniscotherium tapiacitis Cope. Lower jaw portions (A.M. 4425), type 



specimen, lateral and occlusal views. Natural size. San Jose formation, 



San Juan Basin, N. Mex. 

 Fig. 4. M eniscotherium chamense Cope. Right maxilla (U.S.N.M. 1093), type 



specimen, occlusal view. Natural size. San Jose formation, San Juan 



Basin. N. Mex. 



Plate 5. M eniscotherium dentitions from the early Eocene of Wyoming 



Figs. 1, 2. M eniscotherium robustum Thorpe. 1, Left upper dentition, I 1 , C, 

 P 2 -M 8 (U.S.N.M. 18314), occlusal view. 2, Right ramus of mandible, P*- 

 M 3 (U.S.N.M. 18314), occlusal and lateral views. l^X natural size. La 

 Barge, Green River Basin, Wyo. 



Figs. 3, 4. M eniscotherium chamense Cope. 3, Left upper dentition I 3 — M 3 (U.S. 

 N.M. 22435), occlusal view. 4, Left ramus of mandible, Lj-M 3 (U.S.N.M. 

 22435), occlusal and lateral views. VAX natural size. New Fork, Green 

 River Basin, Wyo. 



Figs. 5, 6. M eniscotherium tapiacitis Cope. 5, Right maxilla, P 3 , M^M* 

 (U.S.N.M. 22431), occlusal view. 6, Right ramus of mandible, Mi-M» 

 (U.S.N.M. 22432), occlusal and lateral views. lJ^X natural size. Bitter 

 Creek, Washakie Basin, Wyo. 



Plate 6. M eniscotherium humerus and scapula 

 from the early Eocene of Wyoming 



Figs. 1, 2. M eniscotherium robustum Thorpe. 1, Right humerus (U.S.N.M. 

 19555, restored from U.S.N.M. 19519 and 19556), lateral, posterior, distal, 

 proximal, and medial views. 2, Left scapula (U.S.N.M. 18314), proximal 

 and lateral views. Natural size. La Barge, Knight member, Wasatch 

 formation, Green River Basin, Wyo. 



Plate 7. M eniscotherium fore limb and foot material from the early Eocene 



Figs. 1-10. M eniscotherium chamense Cope. 1, Right humerus (U.S.N.M. 

 22672), anterior and medial views. 2, Left radius (U.S.N.M. 22435), 

 anterior and lateral views. 3, Left ulna (U.S.N.M. 22435), anterior and 

 lateral views. 4-7, Articulated right carpus (U.S.N.M. 22672, pisiform 

 introduced from U.S.N.M. 22918, and trapezoid from Y.P.M. 10276) ; 

 4, proximal view ; 5, distal view ; 6, lateral view ; and 7, medial view. 

 8, Left metacarpals I-V (I, U.S.N.M. 18314; II-IV, U.S.N.M. 22672; 

 V (reversed), U.S.N.M. 22918), proximal view of bases. 9, Articulated, 

 partially composite, right manus, excluding phalanges (U.S.N.M. 22672, 

 except pisiform introduced from U.S.N.M. 22918, trapezoid from Y.P.M. 

 10276, and metacarpals I (reversed), U.S.N.M. 18314, and V, U.S.N.M. 

 22918 (II-IV of 22672 reversed) ), dorsal view. 10, Phalanges of digit 

 II or IV (U.S.N.M. 22918), dorsal view. All natural size. 



Fig. 11. M eniscotherium robustum Thorpe. Distal phalanx of manus (U.S.N.M. 

 18282), dorsal view. 



