ABT. 14 FOBAMINIFERA FROM TRINIDAD CUSHMAN AND JARVIS 29 



Genus DENTALINA d'Orbigny, 1826 



DENTALINA MEGAPOLITANA Reuss 



Plate 9, Figuee 5 



Dentalina meijapolitana Rsniss, Zeitschr. deutsch. geol. Ges., vol. 7, p. 267, pi. 8, 



fig. 10, 1855. 

 Nodosaria megapolitana Feanke, Abh. geol. pal. Inst. Univ. Greifswald, vol. 



6, p. 33, pi. 3, fig. 8, 1925. — Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 



10, p. 595, pi. 18, fig. 16, 1926. 



Test large, fairly stout, tapering, slightly fusiform, greatest 

 breadth developed before the last-formed chamber in the adult; 

 chambers numerous, not inflated, distinct, of uniform shape, gradu- 

 ally increasing in size as added, the later ones often slightly decreas- 

 ing; sutures distinct, not depressed, slightly oblique; wall smooth; 

 aperture radiate, slightly protuberant at the inner angle of the ter- 

 minal face of the last-formed chamber. Length, up to 2; breadth, 

 up to 0.3 mm. 



The figured specimen, while not typical, nevertheless may be 

 included in this species of Reuss. The specimen is an incomplete one, 

 and the species is found in the Trinidad Cretaceous. It has already 

 been recorded from the Upper Cretaceous of Mexico in the Velasco 

 shale and is common in Cretaceous deposits of the general Gulf 

 Coastal Plain region of the United States. 



DENTALINA FILIFORMIS Reuss (?) 

 Plate 9, Figukes 6, 7 



The figured specimens show the early stages as well as some of the 

 later chambers of a slender, slightly curved form which has been 

 referred by Franke ^ to Reuss's species. This form is fairly com- 

 mon in the American Cretaceous of the general Gulf Coastal Plain, 

 as well as of Trinidad. 



DENTALINA CATENULA Renss 



Plate 9, Figukes 8 o, & 



Dentalina catenula Reuss, Sitz. Akad. Wiss. Wien, vol 40, p. 185, pi. 3, fig. 6, 

 1860. 



Test compressed, of a few chambers, slightly arcuate, rounded in 

 transverse section; chambers distinct, inflated, subglobular; sutures 

 depressed, distinct ; wall smooth ; aperture small, radiate, at the end 

 of a distinct protuberance, at the peripheral margin of the chamber. 

 Length, 0.6-0.75 ; diameter, 0.2 mm. 



The chambers in this species are very much inflated and subglobu- 

 lar, and usually only a few of them make up the test. The aperture 

 is especially protuberant. 



'Abh. Preuss. Geol. Landes., vol. Ill, p. 9, pi. 2, figs. 19 a, I, 1928. 



