U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 86 PLATE 19 







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1-6, Operculinoides semm.'si V'aughan and Cole, Meson formation, near Potrero del Llano, Veracruz; 7, 0. jennyi 

 new species, Guayabal formation (Tempoal of ver VViebe and Muir), near Sabaneta, Veracruz, collection H. 

 Jenny no. 1573; 8, 9, 0. vicksburgensis Vaughan and Cole, specimens from Byram, Miss., for comparison with 

 Mexican specimens. X20. 



