OSTEOLOGY OF THE ABMOKED DINOSAXJEIA. 



77 



short, but long transversely; deep at the proximal end, with narrow and rounded 

 distal end.. 



It wiU be observed from the above description that the manus of Stegosaurus 

 is entaxonic, as in Dvplodocus and Brontosaurus. Digits I and II were doubtless 

 provided with a full complement of phalanges terminating with flattened unguals, 

 which in life were the only external evidence of their presence. In digits III, IV, 

 and V the number of phalanges was probably successively more and more reduced, 

 each being terminated by a short transversely elongated functionless phalanx, 

 that in hfe was entirely within the mass of the foot. 



Measurements of fore foot elements. 

 METACARPALS. 





I. 



n. 



in. 



IV. 



V. 



No. 

 7401. 



No. 

 4937. 



No. 

 7401. 



No. 

 4937. 



No. 

 7401. 



No. 

 4937. 



No. 

 7401. 



No. 

 4937. 



No. 

 7401. 



No. 

 4937. 





61 



52 



51 

 41 



mm. 

 91 



SO 



60 

 75 



84 



49 



50 

 2S 



106 



70 



71 

 43 



mm. 



82 



53 



53 

 28 



128 



78 



78 

 40 



.S4 

 56 



34 



mm. 

 HI 



SO 



91 

 45 



64 



52 



55 

 35 



mm. 

 98 



72 



79 

 45 



Greatest transverse diameter proxi- 



Greatest transverse diameter, distal 



Least transverse diameter shaft 



PHALANGES, FIRST ROW. 





21 

 42 



31 



75 



13 



47 



25 

 67 



11 

 39 



20 

 55 



S 

 41 



18 

 152 







Greatest transverse diameter 











PHALANGES, SECOND ROW. 



Greatest lengtii 



61 

 44 



81 

 84 



60 



46 



1 









Greatest transverse diameter 



1 









i 









Pelvis. 

 Plates 2, .3, and 4. 



The pelvis of Stegosaurus is composed of ilium, ischium, and pubis. These all 

 unite to form the acetabulum, which is quite as well closed by bone internally as in 

 the Ceratopsia. Apparently these elements never coossify as is sometimes the case 

 in the adult members of the Sauropoda and Theropoda. 



Ilium (il.). — The ilium is the largest of the pelvic bones. Its most prominent 

 feature is the great anterior extension and the extreme shortness of the postace- 

 tabular part, which is scarcely one-third as long as the anterior portion. 



The preacetabular process consists of a long, thickened, wide vertical plate of 

 bone, which terminates anteriorly in a rounded truncate end (fig. 42). 



Viewed laterally the superior border of the iUum is curved from end to end, 

 the anterior process being directed outward and downward in the articulated 



