46 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.80 



Family ROTALIIDAE 

 Genus VALVULINERIA Cushman, 1926 



VALVULINERIA ALLOMORPHINOIDES (Rents) 



Plate 14, Figures 2a-c 



ValvuUna allomorpliinoides Reuss, Sitz. Akad. Wiss. Wien, vol. 40, p. 223, pi. 



11, figs. 6 a-c, 1860. 

 DisGorMna allomorpliinoides Feankb, Abb, geol. pal. Inst. Univ. Greifswald, 



vol. 6, p. 91, pi. 8, figs. 11 0, b, 1928 ; Abb. Preuss. Geol. Landes., vol. Ill, 



p. 189, pi. 18, figs. 7 a, h, 1928. 

 Discorhis allomorpliinoides Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, 



p. 606, pi. 20, figs. 18, 19; pi. 21, fig. 5, 1926. 



Test biconvex, slightly longer than broad, oval, periphery rounded; 

 chambers distinct, on the dorsal side with the earlier whorls visible, 

 ventrally involute, usually five in the last-formed whorl; sutures 

 distinct, dorsally slightly curved, not depressed, ventrally slightly 

 curved, slightly depressed; wall smooth; aperture narrow, below an 

 overhanging fiat, platelike lip. 



The figured specimen, while somewhat more open in its coiling 

 than is usual in this species, may possibly be included in its range 

 of variation. 



Genus GYROIDINA d'Orbigny, 1826 



GYROIDINA DEPRESSA (Alth) 



Plate 14, Figures 1 a-c 



Rotalina depressa Alth, Haidiuger's Natunv. Abb., vol. 3, p. 266, pi. 13, fig. 21, 



1850. 

 &yroidina depressa, Cushman and Church, Proc. California Acad. Sci., ser. 4, 



vol. 18, p. 515, pi. 41, figs, 4-6, 1929. 

 Rotalia cretacea Carsey, Univ. Texas Bull. 2612, p. 48, pi. 5, figs. 7 a, b, 1926. 

 Rotalia becoarii (Linnaeus) var. ripleyensis W. Berry, in Berry and Kelley, 



Proc. U. S. Nat. Mus., vol. 76, art. 19, p. 15, pi. 3, figs. 10-12, 1929. 



Test much compressed, trochoid, biconvex, the dorsal side often 

 nearly flat, periphery rounded, umbilicus often open; chambers nu- 

 merous, 10 to 12 in the last-formed whorl, distinct; sutures distinct, 

 on the dorsal side nearly flush with the surface, slightly limbate, 

 curved, ventrally slightly curved, nearly radial, slightly depressed; 

 wall smooth ; aperture on the ventral side between the periphery and 

 the umbilicus, low. Diameter, 0.25-0.45 ; height, 0.1-0.2 mm. 



This is one of the common species of the Upper Cretaceous and is 

 very widely distributed in Europe and America. It has had various 

 names. 



