ART. 14 FORAMIISriFEKA FROM TRINIDAD CUSHMAN AND JARVIS 27 



Test composed of few chambers, the earlier ones close coiled, the 

 last two or three uncoiled and globular, all chambers strongly inflated; 

 sutures distinct, slightly depressed; wall smooth throughout; aper- 

 ture in the adult terminal, radiate. Length of adult specimens, 0.75 

 mm. or more. 



This is a widely distributed species in the Upper Cretaceous of 

 Europe and America. The megalospheric form has fewer chambers 

 and the early portion often consists largely of the globular prolocu- 

 lum ; in the microspheric form the coiling is evident and the increase 

 of the earlier chambers less rapid. 



MARGINULINA HUMILIS (Renss) 



Plate 8, Figxtrb 9 



Cristellaria humilis Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, p. 65, pi. 6, 

 figs. 16, 17, 1862 (1863).— CuSHMAN, Bull. Amer. Assoc. Petr. Geol., vol. 10, 

 p. 601, pi. 19, fig. 8, 1926. 



Marginulina humilis Cushman and Church, Proc. Callforula Acad. Sci., ser. 4, 

 vol. 18, p. 505, pi. 37, figs. 3-5, 1929. 



Test elongate, subcylindrical, slightly compressed; chambers dis- 

 tinct, the later ones only slightly inflated, of nearly uniform shape, 

 but increasing slightly in height as added, on account of the fact that 

 the later chambers are less involute; sutures distinct, very slightly 

 depressed between the later chambers ; wall smooth ; aperture radiate 

 and peripheral. Length, 1.2-1.5 ; diameter, 0.4-0.45 mm. 



This is a very common species in the Cretaceous, occurring in Eu- 

 rope and America already known from the Velasco shale of Mexico 

 and from the Cretaceous of California. It occurs also in the Gulf 

 Coastal Plain Cretaceous of the United States. 



MARGINULINA JONESI Reuss 



Plate 9, Figures 1 a, b 



MnrginuUna jonesi Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, p. 61, pi. 5, 

 figs. 19 a, b, 1862 ( 1863 ) .— Bekthelin, Mem. Soc. G^ol. France, ser. 3, vol. 1, 

 p. 34, 1880.— Chapman, Quart. Journ. Geol. Soc, vol. 50, p. 709, 1894; Journ. 

 Roy. Micr. Soc, p. 164, pi. 4, fig. 24, 1894.— Shehlock, Geol. Mag., vol. 1, 

 p. 259, pi. 18, fig. 15, 1914.— Neavekson. Geol. Mag., 1921, p. 462.— Cushman 

 and Church, Proc. California Acad. Sci., ser. 4, vol. 18, p. 507, pi. 38, 

 figs. 7-9, 1929. 



Test elongate, early portion compressed and chambers close 

 coiled, later becoming uncoiled; periphery acute and keeled in the 

 early portion ; later chambers nearly circular in section ; sutures more 

 or less obscured but the ornamentation of the surface, which consists 

 of elongate costae continuing throughout the length of the test, un- 

 broken at the sutures, terminal face smooth; aperture in the adult 



