52 AMPHITHERIID &. 
broken off close to the sockets; both the fifth and fourth 
false molars are entire; the anterior cusp presents the 
same superior size as in the first specimen. The thick 
external enamel, and the silky, iridescent lustre of the 
compact ivory, are beautifully shown in these teeth. The 
third and second grinders are more fractured than in the 
first specimen, but sufficient remains to show that they 
possess the same form and relative size; but the most 
interesting evidence, as regards the teeth, which the pre-_ 
sent jaw affords, is the existence of the sockets of not less 
than seven teeth, anterior to those above described. Of 
these sockets the four anterior ones are small and simple, 
like those of the mole, and are more equal in their size and 
interspaces than in the Didelphys: the fifth socket con- 
tained a small premolar with double fangs; the next is 
a similar socket, and then come four other premolars in 
place with more or less perfect crowns: between the last 
of these premolars and the last molar the empty alveoli 
agree in number with, and occupy the same extent as, 
the first five true molars in the Jaw, cut 16. This fossil 
afforded evidence, therefore, that the dental formula of the 
Amphitherium included thirty-two teeth in the lower jaw ; 
sixteen on each side. 
Thus the Amphitherium differs more considerably than 
the evidence in Cuvier’s possession showed, from the genus 
Didelphys in the number of its teeth. Indeed at the time 
when the great Palzontologist wrote respecting it, believ- 
ing it to have had ten molars, no mammiferous ferine 
quadruped was known to possess a greater number of 
these teeth than the Cape Mole or Chrysochlore, which 
has nine molars on each side of the upper jaw, and eight 
molars on each side of the lower jaw. The Chrysochlore, 
however, is not the only species in which the molars 
