PLATE L XVI. 



Figs. 1-27.— PaJaolagtis hai/cleni. Natural size, excepting figs. 4, 5, 9, 11 6, 13, 14, 15, and 24, which are 



twice natural size. Page 875. 

 Fig. 1. — Auterior part of cranium, palatal view; a, left side; 6, superior view. 

 Fig. 2. — Auterior part of a second individual, palatal view; c, view from the front. 

 Fig. 3. — Otic bulla of another individual, exterual view, displaying meatus ; b, posterior view. 

 Fig. 4.— L(>ft half of palate of skull represented in fig. 1, twice natural size. 

 Fig. 5. — Superior view of left mandibular ramus of another animal. 

 Fig. 0. — Eight ramus of auotber individual, external side; a, internal side; 6, from above; c, from 



below. 

 Fig. 7. — External view of another right ramus. 

 Fig. 8. — External view of a third right ramus; a, internal view. 

 Fig. 9. — Superior view of the ramus represented in Fig. 8, twice natural size ; the first molax not worn, 



the last molar not protruded. 

 Fig. 10. — Left ramus of a younger individual which retains the first two deciduous molars, and in which 



the last molar is not protruded; representing the supposed species Iriciuvi lepormum; o, the external 



side, the external wall removed so as to display the first and second permanent molars in the 



alveolus; 6, superior view. 

 Fig. 11. — Left ramus of a still younger auimal, iu which the first two deciduous molars are the only ones 



present, the crown of the first true molar j ust appearing in the alveolus ; a, the inner side ; 6, superior 



view, twice uatural size. 

 Fig. 12.— Fragment of a left ramus of similar age displaying the same stage of dentition, outer view. 

 Fig. 13. — Superior view of a third r.imu8, twite uatural size. 

 Fig. 14. — Superior view of a fourth ramus of the same age, twice natural size. 

 Fig. 15. — Portion of right maxillary bone disjilayiug three molars of the immature dentition. From 



Fig. 11 to fig. 15 the jaws were formerly referred to the supposed species Tridum avunculus. 

 Fig. 16. — Fragment of right humerus from front ; a, from behind. 

 Fig. ]7. — Distal extremity of a second humerus. 

 Fig. 18. — An ulna, from above. 



Fig. 19. — A radius, from below ; a, from the side ; b, proximal view. 

 Fig. 20. — Right ilium, external aspect; a, internal side. 



Fig. 21. — Proximal extremity of left femur, from the front ; a, from behind; b, proximal view. 

 Fig. 22. — Distal portion of femur viewed from the front ; a, from behind ; b, distal view. 

 Fig. 23. — Eight tibia, iiroximal extremity, from the front ; a, posterior side ; b, proximal extremity ; c, 



distal and median portion of another right tibia from behiud ; d, from front ; e, distal extremity. 

 Fig. 24. — Right astragalus from above; a, from below, like the last figure, twice natural size. 

 Fig. 25. — The same astragalus, inner side ; a, the exterual side, natural size. 



Fig. 26. — Right caleaneum, uatural size, from above; a, from below; b, from the inner, c, from the ex- 

 terual side. 

 Fig. 27.- Left mandibular ramus of an individual not quite adult; type specimen of Palaolaijun aya- 



petillus ; uatural size ; o, the inner side ; b, superior view. 

 Fig. 28.— Pal wolagus turflidus. Left mandibular ramus, inferior view. Page 882. 



Fig. 29. — I.epus eunisianua. Superior dentition, from below ; a, b, c, left mandibularramus, internal, ex- 

 ternal, and superior views. Page 886. 

 Fig. 30. — Ischyromya typus. Left mandibular ramus, inferior view. Page 835. 

 Figs. 31-32. — Paciculu3 insoHtus. Twice uatural size ; 31, first and second superior molars ; 32, inferior 



molars ; grinding faces. From the John Day River, Oregon. Page 854. 

 Fig. 33. — Hesperomys nematodon. Frontal region, from above, natural size; a, inferior view of part of 



same specimen, 1.5 times uatural size, showing unworn superior molars from below. Page 853. 

 Fig. 34. — Part of left ramus, with the grinding faces of the molar teeth well worn ; a, inner side; b, 



superior view. 

 Fig. 35. — Fragment of a right ramus supporting a molar tooth, little worn, exti mal \ iew ; a, internal, 



and b, superior views. 

 Fig, 36. — Portion of a right ramus supporting the last premolar tooth, external view ; a, internal view; 



b, &om above. 



