. FLORIDA STATE GEOLOGICAL SURVEY. 
ELEVENTH ANNUAL REPORT 
CONTENTS 
Page 
Administrative Report 73 
Geology Between the Choctawhatchee and Apalachicola Rivers in Florida, by 
E. H. Sellards and H. Gunter 77 
Statistics on Mineral Production in Florida During 1917 103 
Molluscan Fauna from the Calcareous Marls in the Vicinity of DeLand, Vo- 
lusia Co., Florida, by Wendell C. Mansfield 111 
ILLUSTRATIONS. 
Fig. 7. Chipola River 102 
Fig. 8. Sink South of Chipley 102 
Fig. 9. New Pliocene Invertebrates 122 
MAP. 
Sketch Map Between Choctawhatchee and Aucilla Rivers, and Profile 80 
