TABLE OF CONTENTS. 
INTRODUCTION. 
The Lower Silurian deposits of the Upper Mississippi province: A correlation of the strata Page. 
with those in the Cincinnati, Tennessee, New York and Canadian provinces, and the 
stratigraphic and geographic distribution of the fossils. By N. H. WINCHELL and 
3 OGM @ i O05 531 (00s eee eae etna ier RIOT he OS REECE SACO ACIDS ORO OR MOTE ISD G lxxxiii to cxxix 
CHAPTER VI. 
The Lower Silurian Lamellibranchiata of Minnesota. By EH. O. ULRICH.................... 475 to 628 
CHAPTER VII. 
The Lower Silurian Ostracoda of Minnesota. By EH. O. ULRICH... ........... wees ceeeeees 629 to 693 
CHAPTER VIII. 
The Lower Silurian Trilobites of Minnesota. By JOHN M. CLARKE...............eeeeeeeeees 694 to 759 
CHAPTER IX. 
The Lower Silurian Cephalopoda of Minnesota. By JoHN M. CLARKE.............-...2200005 760 to 812 
CHAPTER X. 
The Lower Silurian Gastropoda of Minnesota. By E. O. ULricH and W. H. SCOFIELD.... 813 to 1081 
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LIST OF PLATES AND THEIR ORDER. 
Plates 3H -4 2 AMIEL DLAC He Ais rares ore tehevelarelelereiste me ehatetetointalebasts[effelstalstetercla ie ele) aiay<\arateiaie’sfere(ayeiaeretals After page 628 
Plates 43-46. Ostracoda............04. Fe EI aN ce Tape coe ak oe are ee After page 628 
Plates:/47-60i aC ep alo pod as eiscnie crete te cinveve a stalslcietotaisteiatetevctelovale!sle CMON lak coe te muchaseseititemieneiereege > ates After page 812 
Plates 61-82. Gastropoda.......... Shi eich eee Acta aeons After page 1082 
[Note. Each plate is accompanied by a full description.] 
