154 HY ENA. 
of ancient natural surgery is well paralleled by the healed 
fractures in the skull of the Mylodon robustus, described 
Fractured and healed skull of an extinct Hyzna, } nat. size. 
and figured im my memoir on that gigantic leaf-eating 
quadruped of South America.* The Oreston cranium 
differs from that of the Hyena crocuta, not only in its 
superior size, but in the absolutely smaller imterspace 
between the occipital condyle and the occipito-mastoid 
process, and in the relatively greater extent of the pos- 
terior plate of the glenoid cavity. 
bones are found in the same caverns.”—Ossem. Fossiles, vol. iv. p. 399, pl. xxx. 
fig. 6 and 7. 
* Description of the skeleton of an extinct gigantic Sloth, &c., 4to. Van Voorst, 
1842. 
