MISSOURI GEOLOGICAL SURVEY. 



PLATE LI II. 



^ 







Sa 



3a 



1C 



4a 



7b 9a 



4b 



lOa 



7c 8b 





///, ! .^vA\\ 



5 



I2a 



Id 



X 9d 



&*> ^ 



I2b 



I3a 



lOb 



/ 





i 



He 



lOa 



I3b 



^r 



lOc 



** 



x yfl 



GASTEROPODS 



Ka 



(r 



