150 HY ENA. 
By its small size, this tooth confirms the deductions 
from other anatomical characters of the closer affinity of 
the extinct Hyzena to the spotted than to the striped spe- 
cies of the present day; and, in its rounded form, M. de 
Blainville sees a confirmation of the specific distinctness of 
the Hyena spelaa from the Hyena crocuta, in which the 
small tubercular molar has a subtriquetral crown. The 
skull of the Hyena crocuta now before me manifests an- 
other distinction in the double fang by which the small 
tubercular molar is implanted in the jaw, whilst that of 
the Hyena spelea was inserted, as M. de Blainville re- 
marks, by a single fang. 
Baron Cuvier has particularly cited the discovery of 
the Hyzena’s remains in the diluvium at Lawford, near 
Rugby, as a proof of that Carnivore having been associated 
in England, as on the Continent, with the Rhinoceros, 
Mammoth, and other great extinct Pachyderms of the 
unstratified drift formations. 
Several instances of the same nature have been subse- 
quently brought to light. Mr. Murchison, in his great 
work, “ The Silurian System,” notices the association of 
the Hyena with the Rhinoceros in a fissure of the Ay- 
mestry limestone, constituting one of the vertical jomts of 
the rock, which had been irregularly opened out by an- 
cient disturbance of the beds, and subsequently filled by 
the drift and detritus of the superficies. ‘‘ These jointed 
rocks form the eastern side of a deep comb, the higher 
parts of which are occupied by the upper Ludlow rock ; 
the lower by the Aymestry limestone, which, where it 
contains the bones, is about forty feet above the little brook 
that waters the valley. In extracting the limestone for 
use, these fissures were perceived to be filled with cal- 
careo-argillaceous cement of a whitish colour, lke hard- 
