147 



VALVES of Obolus lens longus from E. 3e. 



Dimensions 

 &c. of the 



valves. 



The following is a synopsis of the occurrence of Obolus in the Etche- 

 minian strata of Cape Breton, and in the Coldbrook terrane of the same 

 island. 



DISTRIBUTION of Obolus in the Coldbrook and Etcheminian terranes in 

 Cape Breton, N.S. 



Distribution 

 of Obolus in 

 the Basal 

 Cambrian. 



C. B. 



