

^tologital Surlits of t|t MiAt of |i«to gori 



PAL^ONTOLOaT 



Vol. VI. 



CORALS AND BRYOZOA 



TE3CT A.nsriD I'LV^.TES. 



COtfTAIMIHO 



DESCRIPTIONS AND FIGURES OF SPECIES 



LOWER HELDERBEHG, UPPER HELDERBERG AND HAMILTON GROUPS. 



BY 



JAMES HALL, 



STATE OEOLOOIST AND PALEONTOLOGIST. ^t 



ASSISTED BY 



GEORGE B. SIMPSON. 



1^1 



ALBANY, N. Y.: 

 CHARLES VAN BENTHUYSEN & SONS. 

 1887. 



