44 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.80 



Family BULIMINIDAE 

 Genus BULIMINA d'Orbigny, 1826 



BULIMINA TRINITATENSIS Cushman and Jarvis 



Plate 13, Fiqxjbbs 4 a, b 



Bulimina trinitatensis Cushman and Jarvis, Contr. Cushman Lab. Foram. Res., 

 vol. 4, p. 102, pi. 14, figs. 12 a, 6, 1928. 



Test somewhat longer than broad, rounded in transverse section ; 

 chambers distinct with the lower border extended into an overhang- 

 ing plate, which is marked on the upper side by an irregular network 

 of reticulate areas, the outer angles ending in short spines ; aperture 

 elongate, comma-shaped, the apertural face smooth. Length, 0.5; 

 diameter, 0.3 mm. 



The ornamentation of this species is very distinctive and will dis- 

 tinguish it from any described species of the genus. The same species 

 is apparently developed in the Gulf Coastal Plain region of the 

 United States, or at least a very similar one occurs there. 



Genus LOXOSTOMUM Ehrenberg, 1854 



LOXOSTOMUM PLAITUM (Carsey) 



Plate 13, Figube 7 



BoUvina plaita Caksey, Univ. Texas Bull. 2612, p. 26, pi. 4, fig. 2, 1926. 

 Proroporun plaita Cvsilua's, Contr. Cushman Lab. Foram. Res., vol. 2, pt. 4, 

 p. 89, pi. 12, figs. 7 a, J), 1927. 



This species is now widely known from the Cretaceous of the West- 

 ern Hemisphere, occurring in its typical form in the Navarro and its 

 equivalent in the Gulf Coastal Plain region of the United States. 



Family ELLIPSOIDINIDAE 



Genus PLEUROSTOMELLA Reuss, 1860 

 PLEUROSTOMELLA CLAVATA Cushman 



Plate 13, Figures 8 a, b 



Plewostomella clavata Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, no. 6, 

 p. 590, pi. 16, fig. 5, 1926 ; Contr. Cushman Lab. Foram. Res., vol. 3, p. 132, 

 pi. 25, fig. 19, 1927.— White, Journ. Pal., vol. 2, p. 52, pi. 5, fig. 14, 1928. 



Test somewhat fusiform, nearly circular in transverse section, 

 greatest diameter toward the apertural end, periphery very slightly, 

 if at all, lobulate, composed of a few chambers; the sutures distinct 

 but not depressed; wall smooth, finely perforate; aperture at the 



