February 17, 1868. 
The PRESIDENT (PROFESSOR SELWYN, D.D.) in the Chair. 
The following new Fellows were elected : 
C. Trorrer, M.A., Trinity. 
T. W. Dansy, B.A., Downing. 
The President (Professor Selwyn) presented to the Society 
a volume containing two tracts on Coinage, one by Nicholas 
Oresmus ; the other by Copernicus; and made a few remarks 
upon it. 
Communications to the Society : 
(1) On the distinction of Subjective and Objective Pro- 
bability. By C. J. Monro, M.A. 
(2) On the existence in the Pterodactyle pelvis of bones 
like those termed marsupial in the Monotremata, 
and other indications of mammalian affinities of 
Piterodactyles, By H. Sreey, F.G.S. 
The author exhibited a drawing of the femur of a Dimor- 
phodon, and pointed out the close resemblance which it presented 
in form to that of a mammal; he also exhibited drawings of the 
pelvis of the same Pterodactyle, and of those of Iguana, Che- 
lidon, and Echidna: shewing that the first had much more 
affinity with the last than with the other two; he also noticed 
some peculiarities of the brain of the same; whence he concluded 
that the mammalian affinities of the Pterodactyle were too 
marked to be entirely overlooked. 
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