OLIGOCENE. 



(Vicksburg Group.) 



Page 



Subkingdom Radiata 26 



Class Polypi 26 



Subkingdom Protozoa ........ 26 



Class Rhizopoda 26 



Subkingdom Molldsca 27 



Class Lamellibranchiata ...... 27 



" Gasteropoda 28 



Appendix 31 



Addenda 32 



Notes and Explanations 33 



Index of Genera 39 



I 



