U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 86 PLATE 13 



1, 2. Camerina jackfonensis Gravell and Hanna giobo:a, new variety, lower part of Tantoyuca formation, Jaclcson 

 Eocene, collection H. Rankin no. 50, east of Tantoyuca, \"eracruz; 3, Operculinoides willcoxii (Heilprin), Tantoyuca 

 formation, Jackson Eocene, Tantoyuca type locality: Tantoyuca-Chopopo road, east of Tantoyuca; 4, Camerina 

 giiayabalensis, new species, Guayabal, Claiborne, from Mecatepec Well no. S; 5,C. moodybranchensis Gravell and 

 Hanna, Tantoyuca formation, well sample, Poza Rica no. 7; 6, C. jacksonensis Gravell and Hanna, Tantoyuca 

 formation, Tantoyuca-Chopopo road, near Tantoyuca; 7, C. vanderstoki (Rutten and Vermunt), Guayabal forma- 

 tion, collection H. Meyer no. 1017, southern Chila Cortaza, east of Tantoyuca; S, Operculinoides palmareaUnsis, 

 new species, Alazan formation (Hua?teca of Muir), lower Oligocene, Mecatepec Well no. 5, near Poza Rica,\'eracruz. 

 X15. 



