208 Mr. R. Walker on Clays containing Fossils, 
from the heretofore recognized characters of the last tooth of 
that species in having a bilobed posterior termination, apparently 
agreeing in this respect with the last molar of E. plicidens ; 
the enamel and dentine folds, however, extend across the crown, 
like those of the last molar of E..fossilis as figured in the ‘ Fossil 
Mammals.’ It has been observed by Prof. Owen long ago, that 
the fossil horse had proportionally a larger head than obtains in 
the domesticated races. While this is, no doubt, the case to a 
considerable degree, still, were we to assume that the fossil horse 
had as large a head as the recent, in proportion to the size of 
the molar teeth (which, in the case ‘of the former, are often found 
detached), we should be somewhat mistaken. At least, in the 
fossil under consideration, the majority of the teeth are nearly 
as large as the teeth of the cart-horse of the present time, while 
the head itself has evidently been a good deal less. However, 
to show the relative sizes more clearly, I will, as far as practi- 
cable, give the measurements of the fossil cranium, the molar 
teeth, and the tibia, together with similar measurements of a 
Scottish pony and a cart- horse, the latter appearing to me to 
be a fair representative of its class :-— 
Length of the intermaxillary bone (measured , 
cottish Cart- 
over the curve) from the edge of the alveo- pony. Fossil. _ horse. 
lar cavity of the first or middle incisor to inches. inches. _ inches. 
the termination of the ascending apophyses 7+ 83 97 
From the anterior edge, in front of the canine 
tooth of the superior maxillary, in a straight 
line to the orbital cavity . 93 103 122 
Breadth of the superior maxillary, from ‘the 
anterior edge of the first molar to the upper 
edge, at the point where the intermaxillary 
bane terminates: i hee sgt ce ce OE 43 43 
Dimensions of the molar teeth. 
Antero-posterior diameter of the crown of the 
first molar : ele 13 13 
Antero-posterior diameter of second molar.. 1 13 153 
- 3 third molar .. 47; 145% 24153 
es : fourth molar... 32,4 1 155 
Fe rr - fifth molar. ... a5 Iie lye 
fe sixth molar le 145% ~~ lads 
oe ve 3 
Dimensions of tibia. °8 63 73 
Extreme length, including tibial spine or 
central process in the knee-joint........ 131 133 16 
Greatest transverse diameter of the head .. 33 33 dz 
3 of the distal end 3° 24 3e 
Least circumference of the shaft........ -- 43 43 64 
