G. R. Wieland — Notes on the Armored Dinosauria. 1 17 

 Fig. 3. Fig. 3a. 



Figures 3, 3a. — Hieroxaurus Sternbergii Wieland, x -^y. Large broad- 

 based caudal spine of the type, 20 centimeters long. Figure 3 shows the 

 slightly fluted intero-superior side, and figure 3a the rather flat extero-infe- 

 rior surface. The base was broad and heavy, the apex ornately outcurved 

 and sharp. 



The family attribution of both genera along with Polacan- 

 thus Hulke, JSfodosauras Marsh, Palcsoscincus Leidy, Stereo- 

 eephatus Lambe, and Ankylosaurus Brown, we think surely 

 lies within the Nodosauridse of Marsh. 



It is thus seen that the type of Hierosaurus, though promis- 

 ing but little of its true interest when first noted in fragments 

 weathered, broken and scattered in the Kansas chalk hills, 

 shows students as well as collectors that exhausted fossil-bear- 

 ing horizons are as yet unknown. As enumerated, the ele- 

 ments recovered indicate that approximately an entire skeleton 

 was present when erosion of the matrix began. Evidently 

 future search in the Niobrara cannot fail to reveal other com- 

 plete examples, mayhap with their keels fairly in place. 



But for the present the evidence available for even tenta- 

 tively illustrated restorations of mail-clad Dinosaurs remains 

 too baffling:. Perhaps if one were in ignorance of both Pola- 

 canthus and Stegopelta it would be possible to produce a 

 plausible generalized restoration of the armor of our Niobrara 

 form, seeing that it has quite the longest series of finely con- 



Am. Jour. Sci. — Fourth Series, Vol. XXXI, No. 182. — February, 1911. 

 9 



