98 THE DESEADO FORMATION OF PATAGONIA 
The atlas and axis are wanting, and the characteristics 
of the other cervicals 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 
wh ere = Sas ae 
Fig. 56. Cervicals, 5, 6 and 7—1/2 natural Fig. 57. Dorsal 6 and 7—1/2 nat- 
size. ural size. 
were at least fifteen in the series, for | 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 21 mm. 
Thoracic 3, height from base of centrum to spine 56 mm. 
Thoracic 6, length of centrum 22 mm. 
Thoracic 6, height from base of centrum to spine 79 mm. 
Thoracic 14, length of centrum 26 mm. 
Thoracic 14, height from base of centrum to spine 65 mm. 
In my series, there are six lumbars, which is one more 
than is credited to Adinotherium, though in that genus the 
