1§ PROCEEDINGS OF THE NATIONAL MUSEUM vol.80 



This species is peculiar in having depressed chambers. The same 

 form occurs in the Upper Cretaceous of the Velasco shale of Mexico. 



GAUDRYINA OXYCONA Reuss 



Plate 5, Figures 1, 2 



Oaudryina oxycona Reuss, Sitz. Akad. Wiss. Wien, vol. 40, p. 229, pi. 12, figs. 

 3 a-c, 1860; vol. 46, p. 33, 1862 (1863).— Franke, Abh. geol. pal. Inst. Univ. 

 Greifswald, vol. 6, p. 15, pi. 1, figs. 20 a, b, 1925.— Cushman and Church, 

 Proc. California Acad. Sci., ser. 4, vol. 18, no. 16, p. 501, pi. 36, figs. 3, 4, 

 1929. 



Test elongate, conical, tapering, nearly circular in transverse sec- 

 tion; very early chambers triserial, later ones biserial; sutures dis- 

 tinct, slightly depressed, nearly at right angles with the periphery ; 

 wall finely arenaceous, very smoothly finished; aperture elongate, 

 low, at the inner median margin of the chamber in a decided depres- 

 sion. Length, 0.55-1.25; breadth, 0.3-0.75 mm. 



This is a widely distributed and well-characterized species. It is 

 known from the California Cretaceous and occurs also in the Velasco 

 shale of Mexico and in the Cretaceous of the Gulf Coastal region of 

 the United States. 



GAUDRYINA LAEVIGATA Franke var. PYRAMIDATA Cushman 



Plate 5, Figure 3 



Oaudryina laevigata Fbankb var. pyramidata Cushman, Bull. Amer. Assoc. 

 Petr. Geol., vol. 10, p. 587, pi. 16, figs. 8a, b, 1926. — Cushman and Jarvis, 

 Contr. Cushman Lab. Foram. Res., vol. 4, p. 92, pi. 13, fig. 6, 1928.— White, 

 Journ. Pal., vol. 2, p. 313, pi. 42, fig. 7, 1928. 



Test differing from the typical in the stouter form, the early por- 

 tion more pyramidal than the type ; the periphery, instead of rounded 

 and convex, slightly concave. 



This variety is a common one in the Cretaceous of America and 

 is already described from the Velasco shale of Mexico and from this 

 Trinidad material. It occurs widely distributed in the Upper Cre- 

 taceous of the Gulf Coastal Plain of the United States. 



Genus CLAVULINA d'Orbigny, 1826 



CLAVULINA TRILATERA Cnshman 



Plate 5, Figueb 5 



Clavulina trilatera Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 588, 

 pi. 17, fig. 2, 1926 ; Journ. Pal., vol. 1, p. 149, pi. 28, fig. 1, 1927.— Cushman 

 and Jarvis, Contr. Cushman Lab. Foram. Res., vol. 4, p. 93, pi. 13, fig. 8, 

 1928. 



