3^ 



The Iguanodon in the sands of the chalk. 



length of the chevron bones; Fig. 1, represents these six caudal 

 vertebrae in connexion, and having three chevron bones, from the end 

 of which, as they he in the drawing, to the top of the spinous pro- 

 cesses, is twenty seven inches. The original must have had a very 

 upright and thin tail, enormously high in a vertical direction, and as 

 the vertebrae, when in place, could have but little intervertebral sub- 

 stance, the spinous processes must have almost touched each other, 

 and the tail have admitted of motion only laterally. I know of no 

 reptile with such enormous spinous processes. 



Fig. 1. 



