Figure 10. 



northward during the tin E a more seasonable climate than now 



exists, crossed Behring Strait into the old world in the Pliocene times: 

 Thence the march was southward into India, westward into Algeria 

 and gave rise, with modifications to the present camels of those regions. 



Among the curious animals found in the fossil gardens of Brea 

 Rancho, none are more odd and at the same time more plentiful, 

 than the giant ground sloth. This animal is now nowhere known 

 and only very distant relatives are found in the tree sloths, ant- 

 eaters and armadillos of South America. The number of individuals 

 represented in the beds is quite great. The skulls and limb-bones 

 arc met with more often than those of 

 animals. Sufficient have been found to 

 The skull. Figure 10, is a very perfect 

 one. It was a well-matured animal as 

 were badly worn. One other is less robust, 

 The skull of a baby sloth, found next its 



Figure 11. The humerus is of a mature individual, and presents 

 very remarkable developments of prominences and concavaties for 

 muscular attachment, which indicate, in connection with the strength 

 of the bone, a very heavy, strong-built animal. 



The femur shows less irregularity, as is generally the case, but 

 is very much stouter than the humerus. This, in connection with 

 the immense 1 pelvis, Figure 12, which measures 41! inches from ilium 

 to ilium, and the other hind leg bones, proves the animal to have been 

 built somewhat after the fashion of a kangaroo, (although in no 



way related to it) having a light pectoral girdle and limbs, and a 



any other large herbivorous 



build a complete skeleton. 



specimen and a very large 



shown by the teeth which 



but is an inch larger. 



mother, is shown in 



:>,'.) 



