ABT. 14 FORAMINIFEEA PKOM TRINIDAD CUSHMAN" AND JARVIS 23 



Holotype.—U.S.'^M. No. 73818 (Cushman Coll. No. 15316), from 

 Upper Cretaceous of pit at Lizard Springs near Guayaguayare, 

 southeastern Trinidad, British West Indies. 



Remarks. — This is a very interesting and unique species with its 

 peculiar ornamentation, the heavy costae of the surface forming a 

 continuous spiral independent of the individual chambers. 



ROBULUS SUBALATUS (Reuss) 



Plate 7, Figures 1, 2 



CristeUaria subalata Reuss, Denksclir. Akad. Wiss. Wien, vol. 7, pt. 1, p. 68, 

 pi. 25, fig. 13, 1854 ; Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, p. 76, pi. 8, fig. 

 10, pi. 9, fig. 1, 1862 (1863). 



The figured specimens may be referred to this species described by 

 Keuss from the Cretaceous of Europe. Plate 7, Figure 2, shows the 

 more typical form in which the sutures are somewhat raised above 

 the general surface of the test. Otherwise the general form and 

 shape of the chambers are similar, and both specimens are marked 

 by a very broad thin keel. Length, 1.25; breadth, 0.9; thickness, 

 0.5 mm. 



ROBULUS MACRODISCUS (Renss) 



Plate 7, Figures 3 a, b 



CristeUaria macrodlsca Reuss, Sitz. Akad. Wiss. Wieu, vol. 46, pt. 1, p. 78, pi. 



9, figs. 5 a, &, 1862 (1863).— Berthelin, M6m. Soc. Geol. France, s6r. 3, 



vol. 5, p. 48, pi. 3, figs. 6-11, 1880. 

 Lenticulina macrodisca AVhite, Journ. Pal., vol. 2, p. 198, pi. 28, fig. 7, 1928. 



Close coiled specimens, with a very large prominent umbo and an 

 acute periphery, which is occasionally slightly keeled, occur in the 

 Cretaceous of Trinidad and may be referred to Reuss's species. They 

 are distinctly of the Rohulus type, with a very prominent supple- 

 mentary apertural slit as shown in the figure herein. The measure- 

 ments of the figured specimen are: Length, 1.2; breadth, 1.1; thick- 

 ness, 0.55 mm. 



ROBULUS DISCREPANS (Renss) 



Plate 7, Figures 4 a, 6 



Roiulina discrepans Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, p. 78, pi. 9, 

 figs. 7 a, b, 1862 (1863). 



Forms similar to that figured here are referred to Reuss's species 

 described by him from the Upper Cretaceous of Europe. Similar 

 ones occur in the Trinidad material. A comparison of our figured 

 specimen with the type given by Reuss will show the very great 

 similarity in the two. The chambers are not inflated, but gradually 

 increase in size as added. The periphery is subacute, and the aper- 

 tural face somewhat concave. The sutures are flush with the surface 



