276 



TRANSACTIONS OF THE 



[mar. 15, 



Tabulation of the Facts. 



The facts set forth in the preceding notes on the species are 

 here given in tabular form. The species are arranged in three 

 groups, those whose evidence points to the St. Louis age of the 

 formation, those "whose evidence points to its Kaskaskia age, 

 and those whose evidence is indeterminate. 



The following symbols are used to indicate the relative abun- 

 dance of the species: (a)=abundant ; (c)=common ; (r)=rare ; 

 (nonrepresented by single or a very limited number of speci- 

 mens. 



