330 PROCEEDINGS OF THE NATIONAL MUSEUM vol.90 



STUDY OR RESERVE COLLECTIONS 



The collections designated as study or reserve comprise those speci- 

 mens that have been filed away for study, comparison, and reference 

 purposes. They constitute the bulk of the vertebrate fossils now assem- 

 bled. They contain many early types of more than ordinary interest, 

 since they are those that formed the basis for much of the scientific 

 work of Leidy, Cope, and Marsh and thus constitute the primary 

 foundation upon which much of modem paleontology of America is 

 based. These types are constantly in demand for examination and 

 comparison by paleontologists from other institutions of the country. 



These collections now contain representative faunas of most of the 

 more important fossil-bearing formations of North America, together 

 with a sprinkling of foreign materials. Although some gaps still exist 

 and many assemblages need strengthening, taken as a whole it is now 

 one of the important fossil vertebrate collections in America. 



In building up this collection, regular expeditions have been the 

 most prolific source of materials, and the history of these has been 

 covered under the heading "Expeditions," page 323. In the pages to 

 follow, however, it is proposed to review some of the other sources 

 of material in order to give a complete picture of the growth and 

 development of the collection. 



Gifts from individual donors have ever been an important source 

 of materials, but next in importance to the specimens obtained by 

 regularly organized expeditions are those received in exchange for 

 duplicate materials with kindred institutions. Such exchanges have 

 been made possible to a great extent by the large suites of duplicate 

 materials of Brontotheres, Teleoceras, and PUsippus of which the 

 Division of Vertebrate Paleontology is the fortunate possessor. Among 

 the more improtant specimens thus obtained were the following : 



DiNOSAUEIA : 



Oorgosaurus Ubratus — articulated skeleton, 

 Camarasaurus lent us — articulated skeleton. 

 Edmontosaurus regalis — skull and lower jaws. 

 Prosaurolophus maximus — skull and lower jaws. 

 Mammalia : 



Stenomi/lus hitcJicocki — articulated skeleton. 

 Scelidodon capelUna — articulated skeleton. 

 Dicer athermm cooki — composite skeleton. 

 Trigonias oshorni — composite skeleton. 

 Moropus elatus — composite skeleton. 

 Equus Occident alis— composite skeleton. 

 Mylodon harlani — composite skeleton. 

 Aenocyon dirus— two composite skeletons. 

 Smilodon californicus — composite skeleton. 



Since 1911 the curator of the Division of Vertebrate Paleontology 

 has endeavored to assemble in the National Museum as many of the 



