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THE WORKS 



OF 



FRANCIS MAITLAND BALFOUK 



M.A., LL.D., I i 



FELLOW OF TRINITY COLLEGE, 



AND PROFESSOR OF ANIMAL MORPHOLOGY IN I HI I\ OP 



CAMBRIDGE. 



EDITED BY 

 M. FOSTER, F.R.S., 



PROFESSOR OF PHYSIOLOGY IN THE UNIVERSITY OF CAMBRIDGE; 



AND 



ADAM SEDGWICK, M.A., 



FELLOW AND LECTURER OF TRINITY COLLEGE, CAMBRIDGE, 



VOL. IV. 



PLATES. 



Uonfoon : 



MACMILLAN AND CO. 

 1885 



