U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 86 PLATE 18 



1, Operculinoides palmarealensis, new species, Alazan formation (Huasteca of Muir), Mecatepec Well no. 5; 2, O. 

 vicksbuTctnsis Vauchan and Cole, Alazan formation, collection E. Gevaerts no. 292, southern Miahuapam, Vera- 

 cruz; 3. Camerina v3ndfrsioki (Rutten and Vermunt), Guayabal formation, near Furbero. Veracruz., collection J. 

 Clopton no. 21: 4, C. guayahiUns^s, new species, Guayabal (Tempoal of ver Wiebe and Muir), well sample, Poza 

 Rica no. S; 5, Operculinoidts catenida (Cushman and Jarvis), lower part of Chicontepec formation, near Sabaneta, 

 Veracruz, collection W. Tappolet no. 1848. X20. 



