List of Plate*. 



Fig. 





Plate XV. 





A. 



Zonites placentula, Shuttl., 



shell. 



B. 



" macilenius, Shuttl., 



" 



C. 



" cuspidatus, Lewis, 



" 



D. 



" Andrews!,, Binn., 





E. 



lasmodon, var. ? 



" 



F. 



" multidentatus, Binn., 



" 



G. 



significans, Bland, 



" 



H. 



•' RugeK, Binn., 



" 



I. 



' ' Dentition of same. 





J. 



" " " Zonites 



subpldnus, Binn 



K. 



" " " Stenopus ? decoloratus. 



L. 



Mesodon Andrewsi, Binn., 



shell. 



M. 



Macrocyclis IlemphUU, Binn 



., " 



N. 



Dentition of Spiraxis Dunk 



eri, Pfr. 



See page 362 of text. 



