THE MOUNTED SKELETONS OF CMIPTOSAURUS IN THE 

 UNITED STATES NATIONAL I^IUSEUM. 



By Charles W. Gilmore. 



Assistant Curator of Fossil Reptiles, United States National Museum. 



INTRODUCTION. 



Recently the exliibition collection of vertebrate paleontology in 

 the United States National Museum has been enriched by the addi- 

 tion of two mounted dinosaur skeletons from the Morrison Beds of 

 Wyoming. These specimens are unusually perfect as fossil skeletons, 

 and are noteworthy as being the types of the two species Campto- 

 saurus nanus ^larsh (Cat. No. 2210, U.S.N.M.) and Camptosaurus 

 Irowni Gilmore (Cat. No. 4282, U.S.N.M.). Since a detailed descrip- 

 tion of the osteological features of these specimens has been given in 

 a previous article,^ the present paper will briefly describe the mounted 

 skeletons. 



These specimens formed a part of the Marsh collection that was 

 transferred to the Museum some years ago by the United States 

 Geological Survey, and are from one of the celebrated fossil deposits 

 of the Morrison beds, known to the collectors as "Quarry 13, " located 

 about 8 miles east of "Como Bluff," Albany County, Wyoming. 



The skeletons are typical examples of the large and small species 

 of the genus, and as they are mounted upon the same base, show 

 well the great difference in size. (See pis. 56 and 57.) They are 

 standing on a base of artificial matrix that represents the color and 

 texture of the layer of sandstone in which the bones were found. 



The larger skeleton (C. Irowni) is mounted in a quadrupedal pos- 

 ture, an attitude which it is believed was often assumed, and the 

 smaller specimen (C. nanus) has been erected in the more familiar 

 pose of walking on the liind limbs. 



The skeleton of Camptosaurus hrowni was mounted by the writer, 

 while the skeleton of C. nanus was erected by Mr. Norman Boss, 

 preparator in the section of vertebrate paleontology, and to his skiU 

 is due the workmanlike manner of the finish and its life-like pose. 



1 C. W. Gilmore. Osteology of the Jurassic Reptile Camptosaurus, with a revision of the Species of the 

 Genus, and Description of two new species. Proc. U. S. Nat. Mus., vol. 36, 1909, pp. 197-333, pis. 6-20. 



Proceedings U. S. National Museum, Vol. 41— No, 1878. 



687 



