RHINOCEROS LEPTORHINUS. 379 
specimens of Lhinoceros leptorhinus from Clacton, I have 
compared it with the corresponding part of the femur of 
a Rhinoceros tichorhinus, obtained from the drift near 
Moscow. 
The first and most obvious distinction of the Clacton 
femur is the narrower, shallower, and more oblique sur- 
face of the shaft, immediately above the articular surface 
for the patella; the convex ridge continued upwards from 
the internal and more prominent boundary of that surface 
is broader, more rounded, and more gradually blended 
with the shaft of the femur; the whole surface exterior 
to this ridge slopes more suddenly to the outer side of 
the bone, and there is a much deeper excavation below 
the rotular articulation. In the femur of the tichorhine 
Rhinoceros, the transverse exceeds the antero-posterior 
diameter of the shaft six inches from the lower end; in 
that of the leptorhine species, these proportions are re- 
versed at the same part of the shaft. The outer side of 
the femur behind the outer ridge is more concave in the 
Clacton specimen, which measures, from the fore to the 
back part of the external condyle, eight inches; it most 
probably belongs to the leptorhine species. 
In Mr. Brown’s collection there are specimens of upper 
molar teeth of the Rhinoceros leptorhinus from the till at 
Walton in Essex. One of these is the last molar, which 
had just come into use when the animal perished. An- 
other specimen is a third upper molar, worn down to its 
base. The same Geologist also possesses the germ of the 
ante-penultimate molar of a Rhinoceros leptorhinus from 
Grays, in Essex, in which many smaller processes are 
sent off into the principal valley (4), in addition to the 
larger promontory. <A similar modification of a superior 
molar tooth of the leptorhine Rhinoceros from Tuscany 
