152 HY ANA. 
be encrusted with a thick coat of caeementum, as happens 
in aged quadrupeds. 
The Hyena is associated in the till at Walton with 
remains of the spelean Bear and Tiger, the Mammoth, 
Rhinoceros, Hippopotamus, and other Mammalia of the 
extinct Fauna of the newest tertiary and drift periods. 
Remains of the Hyena spelea occur, similarly associ- 
ated with extinct Pachyderms, in the brick-earth at Erith, 
which contains extinct and recent fresh-water shells; and 
im a corresponding formation, constituting a superficial de- 
posit, and fillmg rents that traverse the limestone called 
Kentish Rag, near Maidstone. 
But the most perfect and abundant fossils of the extinct 
Hyena have been discovered under circumstances similar 
to those in which the species was first determined to have 
belonged to the extinct Fauna of this island, viz. in 
limestone caves and fissures. 
The cayernous fissures of the limestone quarries at 
Oreston yielded several specimens of the Hyena spelea, 
among which Mr. Clift distinguished at least five or six 
individuals of various ages; some of them equalling the 
largest of those found at Kirkdale in 1820. The posterior 
part of a skull appeared to Mr. Clift of uncommon magni- 
tude, measuring twice as much from every determinate 
point to another, as a recent full-grown Hyena’s skull.* 
This specimen has accordingly been referred by some 
Paleontologists to the Hyena spelea major of Gold- 
fuss, which M. de Blainville regards with much reason 
as a variety of the common extinct spelean species ; 
merely adding, im reference to the Oresten specimen, 
a remark which calls for more precise dimensions of the 
specimens compared, The only recent skull with which 
* Philosophical Transactions, 1828, p. 87, pl. xi. 
