NATURAL HISTORY MUSEUMS 107 



figured specimens in a total of 9000: types of nearly all the 

 species described by Prof. Cope, except of those collected by the 

 Wheeler survey and now in the national museum. 



B Fossil mammals collected by American museum expeditious 

 1891-1901 in the ancient lake basins of the west, specially those 

 of Tertiary age: all types of species described, and specimens 

 figured in American museum bulletins. Only a part has yet 

 been prepared for exhibition. 



C Fossil reptiles collected in the western Jurassic, Cretaceous 

 ^nd Tertiary beds by American museum expeditions. Not yet on 

 exhibition, 



D Exchange collections from European museums, Munich, Ox- 

 ford, Paris, London, Stuttgart and Leipzig. 



E Pampean collection by Ameghino and others purchased by 

 Prof. Cope in Paris, 1878, and sold by him to the American 

 museum in 1900. 



F Other specimens presented by friends or purchased by the 

 museum. 



Specially noteworthy features of the exhibits are: Series 

 showing the evolution of the horse, rhinoceros, titanothere, 

 amblypod, sloth, tapir and other western American types; com- 

 plete mounted skeletons of Titanotherium, Palaeosyops, Hyra- 

 cotherium (the four-toed horse), Coryphodon, Hoplophoneus (a 

 saber-tooth tiger), Aceratherium, Metamynodon and Hyrachyus 

 (the three American types of rhinoceros), Phenacodus and Eu- 

 protogonia (primitive ungulate types), mastodon, Irish elk, and 

 numerous others not vet readv for exhibition; fine series of 

 complete skulls of uintatheres (Dinoceras), titanotheres, Ameri- 

 can rhinoceroses, etc.; the Mesozoic Mammalia or multituber- 

 culates and early American primates, primitive ungulates and 

 carnivores. 



The specimens not placed on exhibition are intended for use 

 as study collections, and are fully labeled and arranged so as 

 to be most easilv accessible to students. 



Mhwmlogy. The famous Bement collection, with which is in- 

 corporated the reserve series; the Tiffany gem collection, now 



