a 
AMPHITHERIUM. Aq 
talon at the hinder part of its base, and a more minute and 
hardly recognizable one in front; the base of the crown 
is slightly tumid, and from it are continued, without the 
intervention of a cervix, the two long slender almost 
parallel or slightly diverging fangs. The remains of the 
vertically split crown of the third premolar indicate the 
same form as that of the fourth. Traces of the double 
alveolus of the second premolar are preserved at the broken 
anterior end of the fossil. The fractured crown of the 
jirst true molar shews more distinct anterior and posterior 
cusps, at the base of the large middle cusp. The breadth 
of the base of the crown is displayed by the fracture of the 
third true molar, and refutes the notion of their being com- 
pressed like the premolars. The fourth true molar gives a 
view of the anterior, and of the large middle external cusp, 
with part of the posterior external cusp. In the fifth 
molar, the middle external cusp is nearly entire to its sharp 
apex: part of the anterior cusp and the base of the 
internal posterior cusp are preserved; the thicker and 
more complicated crowns of the molares veri, as compared 
with the molares spurii, are unequivocally demonstrated in 
all the last three molars. 
The fangs descend half-way or more towards the lower 
margin of the ramus; their chief constituent, (dentine,) 
is clearly contrasted, by its texture and deeper colour, 
with the surrounding bone, from which they are plainly 
separated by a thin layer of a distinct coloured substance, 
infiltrated, apparently from the matrix, into the sockets 
of the teeth, like that in the vascular canals of the jaw. 
The minute cylindrical remains of the pulp-cavity are 
discernible in many of the exposed fangs. 
In one of the genera of Seals, (Stenorhynchus, F. Cuv.,) 
all the molar teeth are compressed, and tricuspid or multi- 
