26 



CHAPTER IX. 

 Geology of Washington County, HENRY ENGELMANN 145-171 



CHAPTER X. 

 Geology of Clinton County, HENRY ENGELMANN 172-191 



CHAPTER XI. 

 Geology of Marion County, HENRY ENGELMANN 192-218 



CHAPTER XII. 

 Geology of Jefferson County, HENRY ENGELMANN 219-238 



CHAPTER XIII. 

 Geology of Cook County, H. M. BANNISTER 239-256 



CHAPTER XIV. 

 Geology of LaSalle County, H. C. FREEMAN 257-287 



PART II. 



Palaeontology of Illinois, F. B. MEEK and A. H. WOR- 

 THEN 289-565 



Supplementary paper on the Fossil Insects of Illinois, S. 

 H. SCUDDER 566-572 



Appendix Chemical Analyses, J. V. Z. BLANEY 573-574 



24. A. H. WORTHEN; F. B. MEEK and 



Notes on some points in the structure and habits of the 

 Palaeozoic Crinoidea. In Am. Jour. Sci., Vol. XLVIII, 2d 

 ser., pp. 23-40, 1869. (Previously published in Proc. 

 Acad. Nat. Sci. Phila., pp. 323-334, 1868. 



25. A. H. WORTHEN; F. B. MEEK and 



Descriptions of new Crinoidea and Echinoidea from the 

 Carboniferous rocks of the Western States, with a note 

 on the genus Onychaster. In Proc. Acad. Nat. Sci. Phila., 

 Vol. XXX, 2d ser., pp. 67-83, 1869. 



