126 FORAMINIFERA 



Genus VERNEUILINA d'Orbigny, 1840 

 Plate 12, figures 1-3; plate 13, figure 14 



Genoholotype, Verneuilina tricarinata d'Orbigny 



Verneuilina d'Orbigny, Mem. Soc. Geol. France, ser. 1, vol. 4, 1840, p. 39. 

 Bulimina (part) of authors. 



Polymorphina (part) Schultze, Organ. Polythal., 1854, p. 61. 

 Textularia (part) of authors. 



Test usually free, sometimes attached, more or less elongate, 

 tapering, transverse section rounded or triangular; chambers 

 spirally arranged with three chambers making a whorl and the 

 chambers arranged in three vertical columns; wall arenaceous; 

 aperture, a low opening at the base of the inner margin of the 

 chamber. 



Lower Cretaceous to Recent. 



Genus TRITAXIA Reuss, 1860 

 Plate 12, figures 4, 5; plate 13, figure 15 



Genoholotype, Tritaxia tricarinata Reuss 



Tritaxia Reuss, Sitz. Akad. Wiss. Wien, vol. 40, 1860, p. 228. 

 Textularia (part) Reuss, Verst. Bohm. Kreid., pt. 1, 1845, p. 39. 



Test triserial, usually triangular in transverse section; wall 

 arenaceous, often with much cement and smoothly finished; 

 aperture, an elongate opening at the base of the margin of the 

 chamber, becoming rounded and terminal in some species. 



Lower Cretaceous to Recent ( ?) . 



Genus GAUDRYINA d'Orbigny, 1839 



Plate 12, figures 6, 7; plate 13, figure 16 

 Genotype, by designation, Gaudryina rugosa d'Orbigny 



Gaudryina d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 

 "Foraminiferes", p. 109. 



Test in the early stages triserial, later biserial, transverse 

 section angled or rounded; wall coarsely or finely arenaceous 

 often with a large proportion of cement; aperture, typically a 

 low opening at the base of the inner margin of the chamber, or 

 in the wall of the apertural face. 



Lower Cretaceous to Recent. 



