INDEX. 



Page. 



Introduction 5 



Amia whiteavesiana, Cope 12 



Amia macrospondyla, Cope.. .... 12 



Amia exilis, sp. nov 12 



Lepidosteus longus, sp. nov 13 



Rhineastes rhwas, Cope 14 



Amiurus cancellatus, Cope 15 



Amiurus maconn^lli, Cope 16 



Anosteira ornata ? Leidy 17 



Stylemys nebrascensis, Leidy 18 



Testudo exornata, Lam be 18 



Trionyx leuco'potamicus, Cope 19 



Peltosaurus granulosus, Cope 19 



Ogmophis compactus, sp. nov 20 



Crocodilus prenasalis ? Loomis 21 



Didelphys valens, sp. nov 22 



Ancodus brachyrhynchus, Osborn and Wort- 

 man 24 



Anthracotherium ? pygmwum, sp. nov 25 



Elotherium coarctatum, Cope 26 



Agriochcerus antiquus, Leidy 28 



Merychoidodon culbertsoni, Leidy 29 



Poebrotherium ivilsoni, Leidy , . 30 



Leptomeryx esulcatus, Cope.. . 30 



Leptomeryx mammifer, Cope 30 



Leptomeryx speciosus, sp. nov 31 



Leptomeryx semicinctus, Cope 32 



Hypertragulus transversus, Cope 32 



Mesohippus westoni, (Cope) . 33 



Mesohippus prcecocidens, Lambe 34 



Mesohippus propinquus, Lambe 35 



Pagr. 



Mesohippus brachystylus, Osborn 36 



Mesohippus stenolophus, Lambe 36 



Mesohippus planidens, Lambe 37 



Mesohippu,s assiniboiensis, Lambe 37 



Hyracodon nebrascensis, Leidy 39 



Hyraeodon priscidens, Lambe 39 



Aceratherium mite, Cope 43 



Aceratherium occidentalie, (Leidy) 44 



Aceratherium exiguum, sp. nov 44 



Leptaceraiherium trigonodon, Osborn and 



Wortman , 44 



Megacerops angustigenis, (Cope) 45 



Megacerops selwynianus, (Cope) 47 



Megacerops syceras, (Cope) 48 



Megacerops primitivus, sp. nov 49 



Megaceropis assiniboiensis, nom. prov 51 



Chalicotherium bilobatum, Cope 54 



Sciurics ? saskatcheivensis, sp. nov, 55 



Jschyromys typus, Leidy 56 



Gylindrodon fontis, Douglass 56 



Eutypomys parvus, sp. nov : . . . . 57 



Pakeolagus turgidus, Cope . . . 58 



Palaolagus haydeni, Leidy 58 



Hycenodon cruentus, Leidy 59 



Hycenodon crucians, Leidy 60 



Hemipsalodon grandis, (Cope) 61 



Cynodictis lippincottianus, (Cope) 61 



Dapluenus felinus, Scott 62 



Protemnocyon hartshornianus, (Cope) 63 



Dinictis felina, Leidy 64 



12529—9 



