72 



BULLETIN 89, UNITED STATES NATIONAL MUSEUM. 

 Measurements of intermedium. 





Juvenile, 

 No. 7401. 



Adult, No. 

 4937. 





wm. 

 67 

 50 

 41 



mm. 

 97 

 94 

 69 









Ulnare (ul.). — In specimen No. 7401 theulnareis smaller than the intermedium 



and like that bone is triangular in outline when viewed from above (B, fig. 37, ul.). 



It is thinner than the intermedium and articulates dorsally, exclusively with the 



ulna. Ventrally it probably opposed metacarpal IV and part of V. In specimen 



No. 4937 the ulnare and intermedium are so closely ankylosed that the suture is 



almost obliterated. 



Measurements of ulnare. 



Greatest transverse diameter 



Greatest antero-posterior diameter 

 Greatest vertical diameter 



Pisiform (p.). — As identified here the pisiform is an irregularly rounded bone, 

 the smallest element of the cai-pus. In the National Museum material specimen 

 No. 7403 is the only individual which shows this bone as a distinct element (fig. 

 36, where it is shown as found in the quarry). In none of the adult specimens can 



this suture be traced. 



Measurements of carpus. 



[Specimen No. 7403.] 



Interme- 

 dium. 



Ulnare. 



Pisiform. 





81 

 69 



57 



mm. 

 52 

 52 

 41 



28 

 33 

 24 









Metacarpus. — The metacarpus of Stegosaurus consists of five bones of about 

 equal though robust proportions. Semi-articulated fore feet in the National 

 Museum collections supplement one another to such an extent that the position of 

 the metacarpals in the foot can be considered as absolutely determined. Specimen 

 No. 7401 (fig. 37) shows metacarpals I, II, and III of the right manus retained 

 nearly in their relative positions to one another as well as to the carpus, and No. 

 4934 (fig. 40) shows the articulated metacarpals II, III, IV, and V of the left foot. 

 The information fm-nished by these specimens indicates that the metacarpals 

 differ sufficiently from one another to be easily recognized as to their proper posi- 

 tion in the foot when found in a scattered and disarticulated state. (Seepl.21, fig.2.) 



