2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



that Mr. Norman Boss, who has so skillfully done all of this work, 

 spent 345 working days, or over a year, in its preparation. 



It is a composite skeleton, that is, made up of the bones of more 

 than one individual, but all from the same deposit, a small rectan- 

 gular area of about 6 by 7 feet (1828 to 2133 mm.) in extent. In 

 this small space were found the bones of at least five individuals, 

 all pertaining to this one species and all practically the same size. 

 With the exception of two articulated hind feet and three series of 

 caudal vertebrae, one of which. Cat. No. 7953, U. S. N. M., was entire 

 and articulated with the sacrum, and it in turn closely associated with 

 the complete pelvis and femora, all of the other skeletal parts were 

 disassociated, and it Avas quite impossible to determine the precise 

 individual to which they belonged. Specimen No. 7953, U. S. N. M., 

 was used as the basis for the present mount. The ribs and presacral 

 A-ertebrae have been tentatively associated with this rear portion, 

 though it is quite probable that the association in some instances 

 may be in error. 



The skull was found disarticulated, but the sutures interlocked so 

 perfectly as to leave no doubt that the assembled elements belonged 

 to the same cranium. The juvenile character of this particular ani- 

 mal is indicated by the open sutures of the slmll, vertebrae, and 

 sacrum. Wlien fully grown it was doubtless a relatively small 

 species. 



The presacral vertebral series is represented by parts of some 13 

 vertebrae, none of which were found in sequence, nor were any of 

 the neural processes attached to their respective centra. These have 

 been arbitrarily associated, and the position in the column was deter- 

 mined as carefully as possible by comparison with the articulated 

 skeleton of Monoclonius mentioned above. The vertebral column has 

 been given the same number as found in the Monoclonius skeleton, 

 which consists of 14 dorsals and 8 cervicals, or 22 in all, as in Tm- 

 ceratops. Parts of 23 ribs, several of which are complete, have been 

 inserted in the restoration, but, as with the vertebrae, the same doubt 

 exists as to their all belonging with specimen No. 7953. 



The structure of the forefoot is perhaps somewhat conjectural, 

 although as restored it is based on a complete articulated forefoot of 

 Monoclonius^ kindly loaned by the authorities of the American 

 Museum of Natural History, New York. The few foot bones found 

 have been inserted in accordance with the evidence of the borrowed 

 foot. 



The greatest difficulty encountered in mounting this specimen was 

 in articulating the bones of the pelvic arch. It was found to be im- 

 possible to do this properly owing to distortion by crushing of the 



