PLATE 6. 
CoLUMNoporRA RAYI, Nov. Spec. Hudson River Group. 
1. Lateral view of the corallum figured in Plate 5, Fig. 1. 
CoLUMNOPORA CRIBRIFORMIS. Hudson River Group. 
2. Lateral view of a pyriform corallum found in Nelson county. Collec- 
tion of the author. 
COLUMNARIA ALVEOLATA. Hudson River Group. 
3. Portion of the upper surface of a corallum found in Nelson county. 
Collection of the author. 
