List of Casts, Models, and Photographs. 23 



ni, — Photographs of Mounted Skeletons. 



Bromide enlargements from the original negatives. Size, 

 18 in. X 22 in. 



These photographs are taken from the fossil vertebrates 

 in the American Museum, as an exhibition of the Succession 

 of Vertebrate Life in North America. Other skeletons are in 

 various stages of preparation, photographs of which will be 

 added to this series. 



The skeletons show the actual form, proportions, and atti- 

 tudes of these extinct animals as nearly as they can be de- 

 termined or the preservation of the specimen permits. 



The photographs also exhibit the different methods em- 

 ployed in mounting, each method being adapted to the special 

 condition of the fossil. For example, Ccenopus tridactylus , 

 No. II, and Tylosaunis, No. 14, are cases where a low 

 RELIEF mounting was necessary. Amynodon, No. 18, is an 

 instance of the high relief mounting. In some cases the 

 matrix is wholly or partly the original rock in which the 

 fossil was found; in others it is a close imitation of it, made 

 partly by mingling the rock with plaster, thus giving the 

 visitor and student a truer conception of the original em- 

 bedding. Other animals are mounted in full relief, like a 

 recent skeleton, with the aid of concealed, or partly concealed, 

 iron rods. Except when abundant duplicate material is 

 available, each bone is made easily removable for purposes 

 of study, fastened to its mountings by wire ties or by con- 

 cealed screws and bolts. The mounting is under the direction 

 of the Curator and of Mr. Adam Hermann, Preparator. 



Price of the photographs, $4 each. 



I, Metamynodon planifrons Scott & Oshorn. 



Am. Mus. No. 546. 



This aberrant rhinoceros of the Oligocene epoch was dis- 

 covered by Garman and described by Scott and Osborn in 

 1887. The mounted skeleton is a composite from materials 

 obtained by the Amer. Mus. Expeditions of 1892 and 1894 in 



