56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



Plate 8 

 litomylus and protoselene? from the bison basin paleocene 



Figs. I, 3. Protoselene? novissimus, new si)ecies: i, Left ramus of mandible 



(U.S.N.M. No. 20572), type specimen, lateral and occlusal views; 3, right 



ramus of mandible (U.S.N.M. No. 21023), lateral and occlusal views. Four 



times natural size. 

 Fig. 2. Litomylus, cf. scaphicus, new species: Right M' or M' (U.S.N.M. 



No. 21013), occlusal view. Four times natural size. 

 Fig. 4. Litomylus scaphicus, new species: Right ramus of mandible (U.S.N.M. 



No. 21014), type specimen, lateral and occlusal views. Four times natural 



size. 

 Fig. 5. Litomylus scaphiscus, new species: Right ramus of mandible (U.S.N.M. 



No. 21010), type specimen, lateral and occlusal views. Four times natural 



size. 



Plate 9 

 haplaletes and gidleyina from the bison basin paleocene 



Fig. I. Haplalctcs pelicatus, new species: Left ramus of mandible (U.S.N.M. 



No. 21008), type specimen, lateral and occlusal views. Four times natural 



size. 

 Fig. 2. Haplalctcs scrior, new species : Left ramus of mandible (U. of Wyo. 



No. 1078), type specimen, lateral and occlusal views. Four times natural 



size. 

 Figs. 3, 4. Gidlcyina Ziryomingensis, new species: 3, Right ramus of mandible 



(U.S.N.M. No. 20790), type specimen, lateral and occlusal views; 4, right 



maxilla (U.S.N.M. No. 20795), occlusal view. Twice natural size. 



Plate 10 

 phenacodus? from the bison basin paleocene 



Figs. 1-3. Phenacodtis? bisonoisis, new species: i. Right ramus of mandible 

 (U.S.N.M. No. 20567), lateral and occlusal views, li times natural size; 

 2, right maxilla (U.S.N.M. No. 20564), type specimen, occlusal view, li 

 times natural size; 3, right maxilla (U.S.N.M. No. 20566), occlusal view, 

 twice natural size. 



Figs. 4, 5. Pheuacodus? sp. (large) : 4, Right ramus of mandible (U.S.N.M. 

 No. 21025), occlusal view, i^ times natural size; 5, right P* (U.S.N.M. No. 

 21038), occlusal view, twice natural size. 



Plate ii 

 condylarths and titanoides from the bison basin paleocene 



Figs. I, 2. Promioclaciius pipiringosi, new species : i. Right ramus of mandible 

 (U.S.N.^L No. 20571), type specimen, lateral and occlusal views; 2, right 

 ramus of mandible (U.S.N.M. No. 21021), lateral and occlusal views. Four 

 times natural size. 



Figs. 3, 4. Litolestcs lacunalus, new si>ecies : 3, Left ramus of mandible 

 (U.S.N.M. No. 21016), type specimen, lateral and occlusal views; 4, left 

 ramus of mandible (U. of Wyo. No. 1079), lateral and occlusal views. Four 

 times natural size. 



