DIVISION OF VERTEBRATE PALEONTOLOGY — GILMORE 341 



British Museum in exchange) was suspended from the underside of 

 the balcony above the original. There were also plaster casts of 

 Dinoceras^ Megatheriwm^ Dinotheriwtrh^ and Schistojyleurum^ the orig- 

 inal hind limbs and pelvis of Tiicerato'ps, and a hind leg and foot 

 of Apatosaurus {Brontosaurus) . The other wall cases and slope- 

 top diaphragm cases that occupied the remaining floor space were 

 filled with a various assortment of fossil skulls and other skeletal 

 parts of mammals, reptiles, and fishes. 



In 1904 the type skulls of Triceratops calicornis and Triceratops 

 {Diceratops) hatcheri^ a skeleton of Mastodon atnericamis (returned 

 from the St. Louis Exposition), a life-size restoration of jStegosaurm 

 stenops, and a skeleton of Dinomis were added to the exhibition 

 series. In 1905 a composite skeleton of Tnceratops elatus^ the first 

 of this genus to be thus displayed, was installed. The addition of 

 these specimens brought about the retirement of several cases of in- 

 ferior materials. These constituted the exhibition collections until 

 the New Natural History Building was occupied in 1910. Here, for 

 the first time in the history of the Division, adequate and commo- 

 dious exhibition, storage, and laboratory space was provided. Show 

 specimens were assigned to halls 2 and 3, which aggregated 13,950 

 square feet of exhibition room, besides much wall space. 



When the Division moved into the new building many of the older 

 specimens were renovated, most of the skeletal casts were retired, 

 several new specimens were added, and, as a new style of case was 

 provided, the exhibition took on a very much improved appearance 

 (see pis. 49 and 50), although the specimens were far too few to fill 

 the allotted space. 



From 1910 up to the present time there has been a slow but steady 

 growth of the exhibition collections, until at the close of the year 

 1940 there were more than 50 mounted skeletons, ranging in size 

 from the small 14-inch horned rodent Epigaulus hafcheri to the 72- 

 foot Diplodocus longus. 



A complete list of the mounted skeletons is given later, but some 

 of the more outstanding of these are w^orthy of special mention. The 

 articulated skeleton of Basilosobmms cetoides, prepared under the di- 

 rection of Charles Schuchert and mounted under the direction of 

 the late James W. Gidley, is the only specimen of its kind thus far 

 exhibited. The type skeleton of Ceratosawms nasicornis, although 

 discovered more than 50 years ago, is also unique in being the only 

 known specimen of its kind. The assemblage of Stegosaurus speci- 

 mens, consisting of an articulated skeleton in the rock as found, is 

 the only one known that furnishes positive information as to the 

 arrangement of the dermal plates; an articulated skeleton of this 



