ON THE 



STRUCTURE AND AFFINITIES 



OF THE 



GENUS MONTICULIPORA 



AND ITS SUB-GENERA 



CRITICAL DESCRIPTIONS OF ILLUSTRATIVE SPECIES 



BY 



H?!j\LLEYNE NICHOLSON 



M.D., D.Sc, F.R.S.E, F.L.S. 



PROFESSOR OF NATURAL HISTORY IN THE 

 UNIVERSITY OF ST ANDREWS 



WILLIAM BLACKWOOD AND SONS 

 EDINBURGH AND LONDON 

 ^' MDCCCLXXXI 



