AET. 14 FOEAMINIFEEA FROM TRINIDAD — CUSHMAN AND JARVIS 17 



sutures becoming more distinct in the later portion, straight, yerj 

 slightly oblique; wall rather coarsely arenaceous but usually fairly 

 smoothly finished; aperture in the ordinary specimens, narrow, at 

 the inner margin of the chamber with distinct lobular projections at 

 the sides, in very long specimens the aperture tending to be some- 

 what higher. Length, 0.5-1 mm. 



This is a very common species in the Cretaceous in Europe and 

 America and probably in Australia. There is considerable variation 

 in the microspheric and megalospheric forms, the former reaching a 

 much greater size. 



GAUDRYINA RETUSA Cushman 



Plate 4, Figukes 7-10 



Gaudryina retusa Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 588, pi. 



16, figs. 10 a, b, 1926. — Cushman and Jaevis, Coutr. Cusbmau Lab. Foram. 



Res., vol. 4, p. 92, pi. 13, figs. 3, 4, 1928.— White, Journ. Pal., vol. 2, p. 313, 



pi. 42, figs. 8, 9, 1928. 

 Vernetiilina sp. (?) Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 587, 



pi. 16, figs. 12rt, 6, 1926. 

 Vemeuilina rotunda White, Journ. Pal., vol. 2, p. 310, pi. 42, figs. 5 a, h, 1928. 



Test fairly large, stout, nearly circular in transverse section, com- 

 posed of few chambers, early ones triserial, later ones biserial ; cham- 

 bers distinct, somewhat inflated ; sutures distinct, in the later portion 

 slightly depressed; wall arenaceous but rather smoothly finished; 

 aperture comparatively small, low. 



White described a small form as Vemeuilina rotunda. He also 

 records Gaudinjina retusa from the Upper Cretaceous of Mexico, and 

 the range of his V. rotunda is included in his table in the range of 

 G. retusa. It is very probable that the Vemeuilina is only the young 

 stage, perhaps of the microsplieric form of G. retusa. The early 

 triserial stages of Gaudryhia and Clavulina have often been described 

 as species of Veimeuilina in the literature. 



GAUDRYINA INDENTATA Cushman and Jarvis 



Plate 4, Figube 11 



Oaudryina indentata Cushman and Jaevis, Contr. Cushman Lab. Foram. Res., 

 vol. 4, p. 92, pi. 13, fig. 7, 1928. 



Test somewhat elongate, tapering from the subacute initial end, 

 the sides of the adult nearly parallel, circular in transverse section ; 

 chambers numerous, early ones triserial, adult biserial, the middle 

 portion of each chamber indented and the sutures raised in rounded 

 ridges ; wall arenaceous but smoothly finished ; aperture small, semi- 

 circular, at the base of the inner margin of the last-formed chamber. 

 Length, 0.6; diameter, 0.4 mm. 



70827—32 2 



