9 8 



THE DESEADO FORMATION OF PATAGONIA 



The atlas and axis arc wanting, and the characteristics 

 of the other ccrvicals have been given under the generic 

 description. 



MEASUREMENTS, SPECIMEN No. 3291. 



Cervical 3, length of centrum 18 mm. 



Cervical 5, length of centrum 18 mm. 



Cervical 6, length of centrum 21 mm. 



Cervical 6, height from base of centrum to top of spine 74 mm. 



Cervical 7, length of centrum 21 mm. 



Cervical 7, height from base of centrum to top of spine 55 mm. 



The first three or four of the thoracic vertebrae are rep- 

 resented only by their neural arches and spines. There 



Fig. 56. Cervicals. 5, 6 and 7 1/2 natural 

 size. 



Fig. 57. Dorsal 6 and 71/2 nat- 

 ural size. 



were at least fifteen in the series, for I have that number 

 represented, but more probably the number was sixteen as 

 in the case in Adinotherium. Typical vertebrae measure: 



SPECIMEN 3291 



Thoracic 3, langth of centrum 



Thoracic 3, height from base of centrum to spine 



Thoracic 6, length of centrum 



Thoracic 6, height from base of centrum to spine 



Thoracic 14, length of centrum 



Thoracic 14, height from base of centrum to spine 



21 mm. 

 56 mm. 



22 mm. 

 79 m m . 

 26 mm. 

 65 mm. 



In my series, there are six lumbars, which is one more 

 than is credited to Adinotherium, though in that genus the 



