262 Proceedings of the Royal Society of Edinburgh. [Sess. 
Millport, provided me with the material required, and aided me very much 
in points of zoological significance. The work was largely carried out at 
Millport, and Mr John Peden ably assisted me in making records. 
My thanks are also due to Dr J. F. Gemmill for kind interest in 
the work, for suggestions on certain points, and for reading over the 
manuscript. 
Professor A. Meek very kindly gave me facilities for working in the 
Dove Marine Laboratory, Cullercoats, Northumberland, and some of the 
results are due to observations made there. 
The expenses of this research were defrayed by a grant from the 
Carnegie Trust. 
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{Issued separately December 4, 1915.) 
