PLATE XXI Y a. 



Figs. 1-10. — Plesiarctomys deUcalissimiifi. Specimens 5 and 6, natural size. Page 182. 



Fig. 1. — Cranium of No. (i, laterosuperior view ; a, lateroinferiorview, showing all of the alna and radios 

 uot present on the block represented in fig. 4. 



Fig. 2. — Cranium of specimen 5 from behind, showing also the adherent scapula and its coracoid and 

 acromion processes, and two metacarpals ; a, the same from below, showing the adherent proximal 

 parts of the humerus and scapula, with acromion especially displayed, and two metacarpals. 



Fig. 3. — A lumbar vertebra belonging to Nos. 5 or 6, found associated with others, and with the speci- 

 mens No8. 6, 7, 8, 9. These belong to either specimens 5 or 6. 



Fig. 4. — Humerus and parts of ulna and radius of No. 6. 



Fig. 5. — Pelvis of No. (5, external view ; a, from above. 



Fig. 6.— Proximal end of femur. (Erroneously marked No. 10 on plate.) 



Fig. 7. — Distal end of femur. 



Fig. 8. — Distal end of tibia, anterior view; o, inferior view. 



Fig. 9. — Astragalus of No. 6, from above. 



Fig. 10. — Metatarsal of No. 0, from front ; a, from side. 



Figs. ll-l'.i.—I'lesiarctomi/s delicalior. Part of a leg found associated with lower jaws and other bones. 

 Page 18-2. 



Fig. 11. — Distal extremity of tibia. 



Fig. 12. — Astragalus from above ; a, from external side ; b, distal end. 



Fig. 13. — Calcaneuni from above ; a, external view ; ft, distal view. 



Fig. 14.— Part of right mandibular ramus of Plesiarcioniys iMCca(u», external view, natural size ; a, the 

 same from above, one-half larger than nature. Page 179. 



Fig. l^ili't.— Teeth of Calamod&n cijUndrifer. Type specimen ; natural size. Page 192. 



Fig. 1.5.— Molar tooth from side ; b, from opposite side ; a, lateral view ; c, grinding surface. 



Fig. 16. — Part of incisor tooth. 



Figs. 17-21. — Jaw and t«eth of Esthonyx acutidens. Natural size. Page 210. 



Fig. 17. — Maxillary bone and teeth lacking one or two true molars, from below; a, lateral view. 



Fig. 18. — A more posterior molar Ijroken through the middle, from below. 



Figs. 19-21. — Molars of a second individual, natural size. 



Fig. 19. — A superior molar somewhat weathered, from below. 



Fig. 20. — Last inferior mol.-vr exterior view ; a, from above. 



Fig. 21. — Inferior T penultimate molar, external view ; a, from above. 



Figs. 22-25. — Eellionyx spatiilarius. Teeth, natural size. Page 211. 



Fig. 22. — Last inferior molar, external view ; a, from above. 



Figs 23,24. — Premolars, inner side. 



Fig. 2o. — t Canine inner view; a, external view. 



Fig. 26. — Micronyopa scottianua. Left mandibular ramus, external view, natural size; a, from above. 

 Page 217. * 



