xi. MAMMALIA OF STONESFIELD. 235 



Museum. It is the left branch of the lower, jaw, seen internally. 

 It shews sockets for the incisor and canine teeth with one fang 1 ; 

 sockets for three premolars with two fangs; three premolars in 

 place; a vacancy for the first true molar, and then five molars 

 in situ. These molars shew three principal and three accessory 

 cusps, these latter being on the inner side. The teeth are smooth 

 and uninjured; all the molars tricuspid and placed with great 

 regularity. The posterior part of the jaw seems to differ from the 

 same part in A. Prevostii, by the nearer approximation of the 

 condyle and angular processes c. 



Diagram LXXXI. Phascolotherium Bucklandi. Oxford Museum. Natural size. 

 The upper figure enlarged to shew the undulated surface. 



Phascolotherium Bucklandii, the species which fell to Mr. 

 Broderip, on the memorable occasion when first the two friends 

 divided the spolia opima of Stonesfield, is considerably different in 

 form and essential points from those already mentioned. The 

 accomplished naturalist, whose loss we even yet deplore, generously 

 presented his treasure to the British Museum, after having published 

 observations of remarkable interest, and assigned it a place among 

 the didelphidse d . The drawing above given is taken from a specimen 

 in the Oxford Museum, seen internally, less complete in respect 

 of the teeth, but otherwise not less instructive than the original 

 typical example. These jaws are larger than either of those noticed 

 already ; the lower border is more uniformly arched ; the coronoid 

 process slopes more on its anterior edge ; neither of the specimens 

 shews clearly the angular process, which was apparently bent more 

 suddenly inward than in the other fossils. The teeth are counted 

 by Broderip as seven molars and premolars, one canine, three 

 certain and probably a fourth incisor, making in all twelve teeth 



c Figures of this specimen have been given by Owen in the Geological Transactions, 

 Second Series, vol. vi. Plate VI., and in British Fossil Mammals. 



d On the Jaw of a Fossil Mammiferous Animal, found in the Stonesfield Slate. 

 Zool. Journ., 1828, vol. iii., with a plate. 



