252 University of Texas Bulletin 



PLATE 20 



Avicula, Tylostoma, Exogyra, Inoceramus, Hemiaster. Plate 20 



Fiures 1, 2, 11, 12. Avicula Aguilerae sp. nov page 227 



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



Fig. 1. Left valve of specimen. 



Fig. 2. Left valve. 



Fig. 11. Cardinal margin of same specimen. 



Fig. 12. Anterior side. 



Figure 3. Tylostoma aff. ovatum Sharpe page 232 



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



Figure 4. Exogyra cfr. olisiponensis Sharpe page 230 



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

 vano, Coahuila. 



Figure 5. Inoceramus labiatus Schlotheim page 229 



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



Figures 6, 7, 8, 9, 10. Hemiaster sp. . . . page 232 



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

 vano, Coahuila. 

 Fig. 6. Front. 

 Fig. 7. Posterior side. 

 Fig. 8. Left side. 

 Fig. 9. Lower face. 

 Fig. 10. Upper face. 



