248 University of Texas Bulletin 



PLATE 18 



Vascoceras, Neoptychites, Exogyra Plate 18 



Figures 1, 2. Vascoceras Mohovanense sp. nov page 219 



Lower Turonian, lower horizon. Cerro del Macho, Hacienda de Mohovano, Coahuila. 



Fig. 1. Side view. 



Fig. 2. Cross-section and venter. 



Figures 3, 13, 10. Neoptychites aff. Cephalotus Courtiller. pags 221 



Lower Turonian, upper horizon. Cerro del Macho, Hacienda de Mohovano, Coahuila. 

 Fig. 3. Side view. 



Fig. 13. Cross-section and ventef of the external whorl of the same specimen. 

 Fig. 10. Cross-section and venter of the inner whorl. 



Fiures 4, 5, 6, 7, 8. Exoyna Haarmanni sp. nov page 230 



Upper Cenomanian (?). Lowest horizon of Cerro del Macho, Hacienda de Moho- 

 vano, Coahuila. 

 Fig. 4. Side view. 

 Fig. 5. Side view. 

 Fig. 6. Small valve. 

 Fig. 7. Large valve. 

 Fig. 8. Large valve. 



Figures 9, 11. Neoptychites aff. Xetriformis Pervinquiere page 223 



Lower Turonian, upper horizon. Cerro del Macho, Hacienda de Mohovano, Coahuila. 

 Fig. 9. Cross-section and venter. 

 Fig. 11. Side view. 



Figure 12. Vascoceras sp P a S e 218 



Lower Turonian, upper horizon. Cerro del Macho, Hacienda de Mohovano, Coahuila. 

 Side view. 



