50 
ORIGINAL ARTICLES. 
with the front talon, are broken off, the remaining part of the crown 
being composed of seven ridges and a slight posterior talon. These 
ridges are quite intact, and much more apart, than in E. primigenius , 
agreeing in this respect with E. Indicus. The digitations are well 
marked at the apex, forming distinct points, and in the last ridge 
their separation can be traced to a depth of nearly an inch, a con¬ 
dition which ordinarily involves a high degree of crimping of the 
enamel plates. The crown is narrow in front, and widens so abruptly 
behind, as to have suggested to He Blainville the term ‘ subdidyme ’ 
to characterize it; he describes it as resembling most the analogous 
tooth of the existing African Elephant. This peculiarity is best 
expressed by the dimensions, viz., length of crown 2.7 inches, width 
in front at the second ridge 1.1 inches, width behind 1.7 ; the length 
being to the extreme width in the ratio of about 3:2. The empty 
alveolus of the last milk-molar (m. m. 1) is distinctly visible in M. 
Le Clerc’s specimen. The penultimate milk-molar thus yields, for its 
term in the ridge-formula, 8 colliculi besides talons. The specimen, 
so far as mineral condition is concerned, is well fossilized, like those 
from the Sewalik Hills, and the “ Eorest bed ” of the Norfolk coast, 
being hard, heavy, and weathered, and not adherent to the tongue. 
The specimen next to be noticed, is a detached and very finely 
preserved antepenultimate true molar (m. 1) of the lower jaw left 
side, No. 74tla of the additions to the Cat. of Eoss. Mamm. of the 
Boyal College of Surgeons. It is a comparatively late acquisition 
(since 1855), and was brought from Mexico by Mr. Taylor. The 
crown and body of the tooth are quite perfect from end to end; the 
fangs are mostly broken off, but a portion of them still remains. 
The crown is composed of twelve colliculi, with front and hind 
talons. Of these the eight anterior divisions are worn, the rest 
being intact. The discs of wear are wide and open, wider than in 
the ordinary varieties of the existing Indian Elephant, and nearly 
approaching the width commonly presented by JE. antiquus. But 
they differ from those of the latter species, in showing no angular 
expansion in the middle of the discs, and no outlying loop at the 
angles. In this respect they correspond more with the discs of the 
existing Indian Elephant. The edges ( machcerides ) of the enamel- 
plates are highly crimped with numerous close-set flexures ; in this 
respect also maintaining a resemblance to the Indian Elephant, and 
differing from JE. antiquus. Notwithstanding the distinctions here 
indicated, the aspect of the crown in the Mexican molar, bears a 
striking general resemblance to that of typical specimens of the same 
age of JE. antiquus , the most obvious difference being, that the crown 
in the former is much wider in proportion to the length, than in the 
latter, in which the molars have narrow crowns, like those of the 
African Elephant. The specimen is represented by fig. 1 of PI. II. 
A notable peculiarity in the Mexican tooth is, that the body of 
the molar is very much bowed sidewise, i. e. concave on the outer 
side and convex on the inner. The amount of arcuation is much 
greater than I remember to have seen in any other species of 
