14 PEOCEEDINGS OP THE NATIONAL. MUSEUM vol.80 



markings of the cancellated interior, which show distinctly from the 

 outside. 



Family TEXTULARIIDAE 



Subfamily Spiroplectammininae 

 Genus SPIROPLECTAMMINA Cushman, 1927 



SPIROPLECTAMMINA DENTATA (Alth) 



Plate 3, Figures 7 a, 6 



Tewtularia dentata Axth, Haidiiiger's Naturw. Abh., vol. 3, p. 262, pi. 13, fig. 

 13, 1850. 



The figured specimen shows fairly well the characters of this 

 species described by Alth from the Upper Cretaceous of Europe. 

 The chambers are low and broad, with the outer margins often 

 ending in a distinct point. In some respects this species is closely 

 allied to S. anceps (Reuss). 



SPIROPLECTAMMINA ANCEPS (Reuss) var. 



Plate 3, Figxibes 8 a, h 



In the Trinidad Cretaceous, specimens occur that are clearly and 

 closely allied to Reuss's species. Two forms occur, one in which 

 the sutures are distinct but not depressed or raised, and the other, 

 figured herein, in which the sutures themselves are slightly thick- 

 ened. They somewhat resemble such forms as Textularia tnexicana 

 Cushman, known from the Tertiary of this general region and now 

 living in the Gulf of Mexico, and also the form described by W. 

 Berry as Teictularia ripleyensis. This Trinidad form differs from 

 either of these, but material was not sufficient to warrant its being 

 described as a distinct variety. In some respects it resembles the 

 form described as " Bolimna velascoensis " from the Upper Creta- 

 ceous, Velasco shale of Mexico.^ 



SPIROPLECTAMMINA EXCOLATA (Cushman) 



Plate 3, Figures 9, 10 



Textularia excoMta Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 585, 

 pi. 15, figs. 9 a, &, 1926.— White, Journ. Pal., vol. 3, p. 30, pi. 4, figs. 1 a, &, 

 1929. 



Test as broad as long, the sides flattened or somewhat convex; 

 periphery, of early portion at least, acute; chambers few, the sides 

 somewhat concave ; sutures distinct on account of the thickening of 

 the peripheral edge, the surface below being somewhat concave ; wall 

 smoothly finished. 



'•' Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 586, pi. 16, figs. 1 a, h, 1926. 



