479 



Page. 



Meek on Bitter Creek formations 12 



Middle Park, elevations in 76 



subrange, eleyations in 76 



Minorissa alata 63 



Natatores » 17 



Newberry 8 



Niobrara group 5 



Notes on the Eocky Mountain ranges in Colorado Territory, by James T. Gard- 

 ner 72 



Ommatolampis brevipennis ..., 67 



Opomala mexicana 63 



Ortlioptera, descriptions on some new, and notes on some species but little known, 



by Cyrus Thomas = 63 



Otodus 48 



divaricatus 48 



Osyrhina 48 



extenta 48 



Pachyrbizodus .., 42 



caninus 42 



kingii 42 



latimentum 42 



leptopsis 42 



measurements of 43 



sheareri 43 



Palieoscincus 26 



costatus 26 



Park range 74 



elevations in 76 



Pelecorapis 39 



varius 39 



Phasganodus 43 



dirus 43 



fgladiolus 43 



Pierre group 6 



Piratosaurus 28 



plicatus 28 



Pisces 39 



Placer Mountain group 6,7 



Plastomenus 29 



fpunctulatus 29 



? insignis -•- 29 



Platecarpus 35 



ictericus 35 



coryphaeus .. 35 



felix 35 



curtirostris 36 



crassartus 36 



simus 36 



latifrons 36 



gracilis 36 



fglandiferus 36 



mudgei 36 



tectulus 36 



Plesiosaurus . 28 



gulo 28 



occiduus 28 



Point of Eocks 9 



Polycotylus 27 



latipinnis 27 



Polyonax mortuarius 25 



measurements of 25 



Portheus 39 



molossus 39 



thaumas , 40 



lestrio 40 



mudgei 40 



measurements of 40 



gladius 40 



Prefatory note by F. V. Hayden , 1 



