2g2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvt. 



Most of the caudal vertebrae are articulated, the first alone of the 

 anterior ones being detached, but its size and other characteristics at 

 once show its proper place in the series. So closely do they resemble 

 the caudals of C. hrow7ii, described elsewhere, that I shall mention 

 only a few of their important features. 



The second caudal bears the first chevron. As in C. hrowni, trans- 

 verse processes are developed on the first thirteen vertebrae, counting 

 back from the last sacral, where they stop abruptly. As shown by 

 some of the detached transverse processes, they are united to the ver- 

 tebrae by suture, about equally with the upper lateral surface of the 

 centrum and the lower lateral surface of the pedicle of the neural 

 arch. This would appear to indicate ossification from a separate 

 center and would also suggest the appropriateness of calling them 

 caudal ribs, as is done by some anatomists. A distal caudal preserved 

 exhibits the usual long, slender, pre- and postzygapophyses. The 

 important measurements of the vertebrae Avill be found in the table on 

 pages 2tt2 to 24-±. 



Fig. 40. — Right scapula and coracoid (reversed) of Camptosaurus nanus Marsh. 

 Cat. No. 2210, IT. S.N. M. IIolotite. h nat. size. From a photograph. 



The right fore limb, lacking most of the foot, is preserved with 

 this specimen, and is the one on which Marsh based his restoration of 

 the limb of C. nanus, first published '^ in July, 1894, the foot there 

 shown being drawn after that of C. dispar^ No. 1877, Yale Museum. 



The scapula, as will be observed by comparing it with the same ele- 

 ments of the larger species (as shown in fig. 23), shows no appre- 

 ciable differences, except in its much smaller size. Thus, as will be 

 seen, C. nanus can not be distinguished by its " long sigmoid scap- 

 ula," as first defined by Marsh, he being led into this error by a 

 wrong interpretation of the missing upper part of the scapula of the 

 typical specimen of C. dispar., of which he attempted a restoration at 

 the time of describing the present species. 



The coracoid, as compared with the same element of C. dispar and 

 C. hroivni, is shorter antero-posteriorly, more quadrangular in out- 

 line, with a proportionately deeper notch on the inferior border. 



The foramen is not closed, as represented in Marsh's figure, but, as 

 in the other forms, is a notch, being open to the articular border for 



"Arner. Jour. Sci., XLVII, pi. 5, fig. 3. 



