ON THE 



STRUCTURE AND AFFINITIES 



OF THE 



TABULATE CORALS 



OF THE 



PALAEOZOIC PERIOD 



WITH CRITICAL DESCRIPTIONS OF 

 ILLUSTRATIVE SPECIES 



BY 



H. ALLEYNE 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 



MDCCCLXXIX 



