PL AT E XXX I I 1. 



Fig. I. AuLOPORA CONFERTA. Hamilton group, Little Traverse Bay. 

 2 serpens. " " 



3. QuENSTEDTiA UMBELLiFERA. Corniferous limestone drift. 



4. Upper specimen, Aulopora erecta. Hamilton group, Thunder Ba)'. 

 Lower right hand specimen, Cannapora junciformis. Clinton group, 



Brockport, N. Y. 

 Left-hand specimen, Cannapora JUNCIFORMIS. Niagara group, Point De- 

 tour. 



