108 R. S. Lull — Cretaceous Armored Dinosaur , 



Caudal Vertehrce 

 (PL I. ^g. 5; text fig. 3.) 



Thirteen caudal vertebrae are present, together with 

 impressions in the matrix and fragments of at least four 

 more. The vertebrae seem to be fairly representative of 

 the entire series, as there are seven apparently proximal 

 ones, two from near the middle of the tail, two from the 

 posterior two thirds, and two from near the distal end. 



Judging from the character of the sacrum, with its 



Fig. 5. — Left femur of Nodosauriis textiUs. A, anterior, B, external, 

 C, posterior aspect, n, notch. One-eighth natural size. 



small centra and low spines, there are no caudals which 

 correspond to the short, high-spined, large-centrum, 

 anterior caudals of Stegosaurus in form. The corre- 

 spondence is, on the other hand, more with the anterior 

 caudals of Scelidosauriis. The numbering of the caudals 

 in the following description is arbitrary and merely 

 approximate. 



Caudal 4 (pi. I, fig. 5; text ^g. 3). — This bone is well 

 preserved, having the entire neural arch and spine, 

 overlain on the left with dermal bones. While both 

 diapophyses are absent, the impression of that of the left 



