60 AMPHITHERIID #. 
dyloid (a) and coronoid (4) processes have both left their 
impressions on the matrix: the angle of the jaw is frac- 
tured: there is the same shallow, wide and smooth groove (¢) 
near the lower margin of the jaw, and the same notch (/) 
in the symphysis, as in the Amphitheriwm Prevostii, and 
the Myrmecobius. 'The chief value of the specimen in the 
Museum at York, arises out of the very perfect state of the 
crowns of the molar teeth, the peculiar form of which, 
giving one of the characters of the extinct genus, could not 
be satisfactorily determimed from the specimens before 
described. That the fossil in question belongs to the genus 
Amphitherium is proved by the number and nature of the 
teeth which it contained ; but its difference of size, as com- 
pared with the jaw of Amphitherium Prevostii, is greater 
than has been observed in mature individuals of the same 
species of Placental or Marsupial Insectivores. I have, 
therefore, indicated the species which the present fossil 
represents by the name of Amphitherium Broderipii, in 
honour of the Naturalist and Geologist, to whom we are 
indebted for the first accurate description and figure of a 
Stonesfield Mammalian fossil.* 
For the opportunity of describing and figuring the half 
jaw of the Amphitherium Broderipii, in the Geological 
Transactions, I was indebted to Professor Phillips, to whom 
I again beg to record my obligations for the facilities 
afforded me in studying this additional evidence of the 
oldest Mammalian inhabitants of this Planet. 
* See the “ Observations on the Jaw of a Fossil Mammiferous Animal, found 
in the Stonesfield Slate. By W. J. Broderip, Esq., Sec. G.S. F.L.S., &c.” 
Zoological Journal, 1828, vol. ii. p. 408, pl. xi. 
