ROOM III. CAUDAL VERTEBRAE OP THE IGUANODON. 273 



imbedded in a slab of Tilgate grit, that is placed in the middle 

 of the lowest compartment of this Case. 



6 



LIGX. 57. Six CAUDAL VERTEBRAE OF THE IGUANODON; FROM TILGATE FOREST. 

 (^nat.tize.) 



a. a. The spinous processes, from 13 to 15 inches in height. 



6. b. Three displaced chevron bones, or hamapophyses, imbedded in the stone 



near their original position between the bodies of the vertebrae, 

 c. Anterior articular face of a vertebra. 



The characters of the anterior caudal of a young Igua- 

 nodon are beautifully displayed in this invaluable specimen. 

 The bodies of the vertebrae lie in natural juxta-position, the 

 anterior oblique processes embracing the posterior ; the spinous 

 processes are entire and in their normal situation, and the 

 transverse but little mutilated. Three displaced chevron-bones 

 are imbedded near the corresponding articular surfaces of the 

 bodies of the vertebrae, the proximal ends of two of them 

 being almost in contact with the intervertebral spaces to 

 which they belonged. The original position of the respective 

 parts will be understood by reference to Lign. 35, p. 164, 

 figs. 3, and 3 a, which is intended to illustrate the normal 

 characters of the caudal vertebrae of the Iguanodon, and the^ 



