———————n—— OSS 
’ 
GrEoL Mac, 1888. DECADENUE Viol. Vien bu. lhe 
Caudal vertebra, spines, and plate of Diracodon laticeps, Marsh; seen from the 
left. One-sixth natural size. a, right anterior spine; a’, left anterior 
spine; 0b, small caudal plate; ¢, chevron bone; yg, right posterior spine; 
wy’, left posterior spine; ¢, terminal vertebra; v, median caudal vertebra. 
From the Atlantosaurus Beds of the Upper Jurassic, Southern Colorado. 
