U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 86 PLATE 14 



1, 2, OperculinuiJfs amigi-ensis Va'jghan and Cole (fig. 1, microspheric form. Meson formation, below Tampico Country 

 Club, Tampico, Tamaulipas; fig. 2, megalospheric form. Meson formation, near Bustos, Veracruz); 3, S, 0. tuber- 

 culatus (Vaughan and Cole), Tantoyuca formation, collection W. H. Hegwein no. 1559, near Tantoyuca, Veracruz; 

 0. muiri, new species, Alazan formation, collection E. Gevaerts no. 269, southern Miahuapam, Veracruz; 6, 8, 0. 

 caienula (Cushman and Jarvis), lower part of Chicontepec, near Sabaneta, Veracruz, collection VV. Tappolet no. 1908; 

 7, 0. jennyi, new species, Guayabal formation (Tempoal of ver Wiebe and Muir), near Sabaneta, collection H. 

 Jenny no. 1573. X15. 



