BRUNIQUEL, AND ITS ORGANIC CONTENTS. 
551 
I would have given the dentition, and the results of comparison of my fossils there- 
with, of the Ghor-khur ( Equus onager , Pallas*), of the Equus tcenioqpus, Heuglin, and of 
the Koulan (Equus hemvppus, Isid. Geof. St.-Hilairef) ; but to wait for such oppor- 
tunities threatened indefinite delay. The observations, moreover, described in the pre- 
ceding pages, carried on at intervals of leisure, and as opportunities occurred, had 
brought me to conclusions relative to the Equine fossils of the Cavern of Bruniquel 
which seemed worthy of being communicated to the Royal Society. I nevertheless can 
only regard them as a commencement of that which the subject of Equine fossils in general 
requires. There remains to be worked out, and no doubt ultimately will be worked out, 
the range of variety to which the dental characters of the several existing species of 
Equines may be subject. 
Specimens, however, of Dshiggettais, Kiangs, and other wild Asses or unstriped Equines, 
are rare in Menageries and Museums, as are also those of Zebras, Quaggas, Dauws, and 
others of the striped species. 
But a beginning must be made ; and if I may judge from my own wants and wishes, 
the figures illustrative of the present Memoir will prove acceptable to those who may 
be better qualified to carry on this line of palaeontological research. 
I subjoin a note of the range of size, expressed in French millimetres, which I have 
observed in certain molars of existing Equines, as to antero-posterior extent or length 
of grinding-surface, upper jaw : — 
In Equus eaballus, p> 2, from millims. 36 to 40 ; jp 3, from millims. 28 to 32 ; jp 4, from 
millims. 26 to 30 ; ml, from millims. 24 to 28 ; m2, from millims. 25 to 27 ; m 3, from 
millims. 28 to 37 (m3 in some varieties of Horse does not exceed 3 in length); d 2, 
from millims. 34 to 39 ; d 3, from millims. 27 to 30 ; d 4, from millims. 28 to 29. 
In E. asinus, p 2, from millims. 28 to 35 ; m 3, from millims. 21 to 24. 
In E. zebra, jp 2, from millims. 32 to 35 ; m 3, from millims. 23 to 24. 
In E. quagga,p> 2, from millims. 37 to 39; m'3, from millims. 22 to 29 
In E. hemionus, jp 2, from millims. 33 to 36 ; m 3, from millims. 22 to 25. 
In E. Burchelli, p 2, millims. 38; m 3, millims. 25. 
In E. spelceus, from millims. 37 to 39; m 3, from millims. 25 to 27. 
For further aid in comparisons the following dimensions are given in the subjoined 
Table of Admeasurements. 
* A mare, from Kutcli, was received at the Zoological Gardens in May 1849. 
t A mare, from Syria, was presented to the Zoological Society in October 1854. 
4 E 2 
