208 



It. S. Lull — Armor of Stegosaurus. 



the second quarter of the tail, reaching its maximum where the 

 two rows merge into one and finally dwindling again toward 

 the tip. 



In the specimen of Stegosauriis stenoj?s, No. 4934 of the 

 National Museum, the last three plates, those over the sacral 

 region, lie as though they had fallen to the right, the anterior 

 ones to the left, a thing manifestly impossible in plates 

 naturally procumbent on either side. 



Fig. 9. 



Fig. 9. Section of the proximal part of the tail of Stegosaurus ungulatus. 

 c, chevron ; n, neural process; other letters as in fig. 7. 



