NO. 1878. MOUNTED SKELETONS OF CAMPTOSAURUS—GILMORE. 695 



The skeleton as mounted is composed of the bones of one individual 

 with the exception of the second and thh-d metatarsals of the left 

 hind foot which are from another individual (Cat. No. 5960) of the 

 same proportions, and from the same quarry as the type. The other 

 missing parts have been restored and painted a light color to make 

 these distinct from the fossil portions. 



As shown in plates 57 and 59 the specimen has been given the 

 bipedal pose, with the intention of conveying to the observer the 

 impression of a rapidly walking animal. The head is thrown forward, 

 the arms balancing the sway of the shoulders. The right hind leg 

 is at the end of the forward stride and bears the greater part of the 

 weight of the animal. The left foot is just about to be lifted pre- 

 paratory to the forward step, while the tail is doubly curved and lifted 

 slightly from the gi'ound to balance the weight of the forward part 

 of the animal. 



The head is comparatively small, and carried on a gracefully curved 

 neck of moderate length. The thoracic region, which has 16 dorsal 

 vertebrae, is of good proportions, and as the articulated ribs show 

 in the posterior view (see pi. 60), the back was broad with a widely 

 expanded body cavity. The animal was supported by stout clawed 

 limbs of which the hinder are much longer and stouter than the fore. 

 In life this animal was evidently strong and agile in movement, and 

 the structure of the feet, as in C. hrowni, appear to indicate a strictly 

 land-living form. 



Unlike several of the other predentate dinosaurs, there have been 

 no dermal ossifications found, so we have no knowledge as to the 

 character of the external covering. The line drawing (see pi. 61) 

 shows clearly the restored and original parts of the skeleton. 



The caudal series consists of 42 vertebrae, of which 31 are con- 

 sidered as carrying chevi'ons. 



The ischia, as articulated in these two skeletons, only meet at 

 their distal extremities. The writer is, however, inclined to the 

 opmion that in life the borders of the lower part of their shafts were 

 in contact, somewhat after the manner of the ischia in Trachodon 

 and Ceratosaurus, but, probably owing to distortion, it was found 

 impossible to so articulate them when mounting the specimens. 



As with Camftosaurus hrowni, the skull, which is wholly restored, 

 is modeled in the proper proportions after a study of all known 

 cranial material, and undoubtedly gives an accurate idea of the 

 cranium. 



In order to place on record all of the evidence relatmg to the 

 primary association of the backbone of this skeleton, a complete list 

 of the articulated vertebrae as found is given below. 



Axis free; 3d cervical to 2d dorsal articulated; 3d dorsal free; 4th 

 to 8th dorsals articulated; 9th to 13th dorsals articulated; 14th dorsal 



