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on examining it, found that the cast of the brain was remark- 
ably clear and perfect. The characteristics disclosed by this 
cast, when developed, were very remarkable; it did not resemble 
those of the pisces or reptilia, but presented affinities to some 
extent with the birds, and still more with the lowest orders of 
mammalia, especially with the ornithorhynchus. This discovery 
corroborated the theory advanced some time since by Mr Seeley, 
that the Pterodactyles were much more nearly allied to the birds 
than to the reptiles. 
(2) Note on the Pterodactylus macrurus (Seeley) a new 
species from the Purbeck Inmestone, indicated by 
caudal vertebre five inches long. By Mr H. 
SEELEY, F.G.S. 
This specimen was remarkable for its extraordinary size, the 
largest that has been obtained from the Cambridge chloritic 
marl being one and a half inches long. 
(3) Note on the thinning away to the westward in the Isle 
of Purbeck of the Wealden and Lower Greensand 
strata. By Mr H. Seetey, F.G.S. 
The various sections made by Mr Seeley, in company with 
Mr Sedley Taylor, of Trinity College, were carefully described 
and tabulated. 
(4) On the coincidence of the Moon’s periods of rotation 
on her axis and synodical revolution round the 
earth as an electro-magnetic phenomenon. By 
Mr Porter. 
The whole discussion of the moon’s rotation on her axis 
commencing with Newton’s original solution, supposes that the 
periods of rotation on her axis and of her synodical revolution 
round the earth, were equal or nearly equal, whilst her mass 
