882 
convinced both the Marquis Doria and myself that we had before — È 
us the true Ch. villosum, and therefore that the specimen so. 
well described and figured by Dobson must be new. 
So far as can be made out from Peters’s description, it would 
also appear probable that the second specimen, a skeleton, just 
OLDFIELD THOMAS 
measured and briefly referred to by him, was an example of 
Ch. doriae, but even if this were so, we should evidently have 
to take as the type of his species the one figured in his plate, from 
which also all the main part of his description was drawn up. 
Both the species having been separately described, the one by 
Peters and the other by Dobson, and the teeth of Ch. doriae 
ficured, it is only necessary to point out the differences between 
the two, and, apart from the greater size of Ch. dorzae, these 
lie almost wholly in the shapes and relative sizes of the teeth. 
Inner upper incisor 
Outer upper incisor 
Canine both upper and 
lower 
Anterior 
molar 
upper pre- 
Posterior upper pre- 
molar and two mo- 
lars 
Anterior 
molar 
Posterior lower premo- 
lar, and the two mo- 
lars 
lower. pre- 
Ch. doriae. 
broader, the cusp placed 
obliquely and. meeting its 
fellow of the opposite side 
at its tip. 
larger, nearly half the 
height of the inner inci- 
sor; sharply pointed, co- 
nical. 
shorter and stouter. 
larger and longer, more 
than halfthe height of the 
posterior premolar. 
larger, combined length 6.0 
mm. 
with a distinct anterior 
cusp. 
combined length 6.3 mm. 
Ch. villosum. 
slender, styliform, the long 
simple cusp vertical, pa- 
rallel to its fellow and not 
approaching it termi- 
nally. 
minute, barely one fourth 
the height of the inner 
incisor. 
longer and slenderer. 
smaller and shorter, less 
than halfthe height of the 
other premolar. 
smaller, combined length 
7.4 mm. 
nearly fiat-crowned, with- 
out a distinct cusp (!). 
combined length 8.2 mm. 
In external characters I can find no marked distinction except 
size, but it is impossible to compare satisfactorily the dried type 
(1) Peters says in a foot note to his description of this tooth « Ani dem einen 
Exemplar ist die Spitze dieses Zahns ganz weggeschliffen ».. 
