1888.] Dr A. Bruce on Absence of Corpus Callosum. 341 
Meynert’s theory of its anatomical connections. It is right to state 
that Meynert’s opinion is based on no proof whatever, and the 
physiological view is equally speculative. It was supposed to 
account satisfactorily for the idiocy or imbecility of most of the 
cases. But examination of the literature shows that where there has 
been imbecility there has always been some other grave brain defect. 
On the other hand, the cases of Eichler, Paget, Malinverni, Jolly, 
and that recorded by me, and the second case of Kaufmann, and that 
of Erbs, Vircli. Arch.., 96, show that, where the brain is otherwise 
well developed, there may be no disturbance of mobility, co-ordina- 
tion, general or special sensibility, reflexes, speech, or intelligence, 
whether the defect of the corpus callosum be primary or secondary. 
The radiated convolutionary arrangement is very difficult to 
explain. It may be due to the mechanical resistance offered by the 
ring-like marginal arch to the growth of the grey matter of the gyri. 
This will thus become furrowed much as a bag made of cloth when 
a string is tied tightly round its neck. In this case, too, the furrows 
radiate outwards from the string. The abnormal mesial fissure of 
Rolando is not found in other cases. I am at a loss to account for 
it except on the view that the forward growth of the brain has 
surpassed that of the cranium, and that a duplicature of the inner 
surface was thus produced. 
4. Distribution of some Marine Animals on the West 
Coast of Scotland. By Dr John Murray. 
5. Remarks on the Larvse of certain Schizopodous Crus- 
tacea from the Firth of Clyde. By Wilham E. 
Hoyle, Esq., M.A. 
PRIVATE BUSINESS. 
A ballot was taken, and the following candidates were elected 
Fellows of the Society: — Mr John Scott, C.B.; Dr D. Berry Hart ; 
Mr Magnus Maclean, M.A.; Mr Hugh Marshall, B.Sc.; and Mr 
James Walker, C.E. 
