HUMERUS FROM THE STONESFIELD SLATE. 463 
He thought that Prof. Seeley’s views as to the predominantly 
monotrematous character of the animal were hardly supported by 
the evidence adduced, and that if the jaws of Phascolotheriwm had 
not before been discovered the identification might not have been 
made. 
Mr. CHARLEsWorTH insisted on the important discovery of bones 
other than mandibular in the Stonesfield Slate, a discovery which 
had been looked forward to in vain since 1814. He cited and ex- 
pressed doubt on the explanation of Prof. Owen, that the lower jaws 
had fallen away from the floating skeletons. 
Mr. Buaxe argued in favour of both the bones belonging to one 
specimen, and pointed out that the greatly modified bone (the hu- 
merus) was the one most likely to vary with the habits of the 
animal, 
Prof. Srrtzy, in reply, expressed his thanks for the compliments 
which had been paid him. He defended his identification and in- 
terpretation, his comparisons of the lengths of the limb-bones and 
jaws in different orders of mammals, and his conclusion that the 
bones had monotreme affinities. He should have arrived at the 
same conclusion if no jaws had ever been found. 
Q.J.G.8. No. 139. 2x 
