TABLE OF CONTENTS 



Preface, ......... 



On the Geology of the Tertiary Formations of Dakota and Nebraska. By 



Prof. F. V. Hayden, ....... 



Extinct Mammalia of Dakota and Nebraska, including an account of some 



allied forms from other localities. By Prof. Joseph Leidy, 

 Introductory Remarks, ........ 



CARNIVORA, 



Oanidx, 

 Canis, . 

 " ssevus, 

 " temerarius, 

 " vafer, 

 " Haydeni, 

 Amphicyon, 



" vetus, 



" gracilis, 



Hymnodontidx, 

 Hy^nodon, 



" horridus, 



" cruentus, 



" crucians, 



Felidx, 



PSEUD^LURUS, 



" intrepidus, 



Deepanodon, . 



" primrevus, 



" occidentalis, 



DXNICTIS, 



" feliua, 



iELUEODON, 



" ferox, 



Ursidx, 



r 



Leptarctus, . 



" primus, 



28 



29 



30 

 31 

 32 

 36 

 88 



39 

 47 

 48 

 52 



.53 

 54 

 63 

 64 



08 



70 



RUMINANTIA, . 



Oreodontidie, 



Oreodon, 



" Culbertsoni, . 

 " gracilis, 

 " major, 

 " affinis, 

 " hybridus, 

 " bullatus, 

 Merycochcerus, 



" proprius, 



Meeychyts, 



" elegans, . 



" medius, . 



" major, 



Leptauchenia, 



" major, . 



" decora, 



" nitida, 



Aijriochoendx, 



Agkiochcerus, 



" antiquus, 



" major, . 



" latifroas, 



Camelidic, 



PCEBROTHERIUM, 



Wilsoni, 



8 



9 



23 

 II 



71 



72 

 86 

 94 

 99 

 105 



106 

 110 



115 

 118 

 119 

 121 

 122 

 124 

 127 

 129 

 131 

 132 



134 

 135 



141 



