KKI.ATK'N OF STRATA. 



OXXVII 



Tn),l,- nli inn./ number of gpecirt restricted to each of the Lower Silurian groups in the 

 T Mia*i*aii>i'i region, number of tame occurring in one or more of the four <>Vu-r 

 x, and Ihf formniinna in irhn-h Ihry are foitml. 



