ON THE 



STRUCTURE AND AFFINITIES 



OF THE 



TABULATE CORALS" 



OF THE 



PALEOZOIC PERIOD 



WITH CRITICAL DESCRIPTIONS OF 

 ILLUSTRATIVE SPECIES 



BY 



H. ALLEYNE NICHOLSON 



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



riJOFKSSOR OF NATUKAL HISTORY IN THE 

 U.NTVKKSITY OV ST ANDREWS 



WILLIAM BLACKWOOD AND SONS 



EDINBURGH AND LONDON 



MDCCCLXXIX 



