FAMILY 31. BULIMINIDAE 253 



Genus BIFARINA Parker and Jones, 1872 



Plate 36, figures 12, 13; plate 37, figure 10 

 Genoholotype, Dhnorphina saxipara Ehrenberg 



Bifarina Parker and Jones, Ann. Mag. Nat. Hist., vol. 10, 1872, p. 198. 

 Dimorphina Ehrenberg, 1854 (not d'Orbigny). 



Test with the earlier chambers biserial, later ones uniserial, 

 the uniserial portion making up the larger part of the test in 

 most species; wall calcareous, perforate; aperture in the young 

 as in Bolivina, later terminal and rounded. 



Cretaceous to Recent. 



Subfamily 5. Reussiinae 



Test distinctly triserial, at least in the young of most forms, 

 in specialized forms becoming uniserial ; aperture in the simpler 

 forms and in the young, elongate, in the uniserial forms and 

 some of the triserial ones, cribrate. 



Genus REUSSIA Schwager, 1877 



Plate 36, figure 14; plate 37, figure 14 

 Genoholotype, Verneuilina spinulosa Reuss 



Reussia Schwager, Boll. R. Com. Geol. Ital., vol. 8, 1877, p. 26. 

 Verneiiilijia (part) of authors (not d'Orbigny). 



Test distinctly triserial, triangular in transverse section, 

 broadest at the apertural end ; wall calcareous, perforate ; aper- 

 ture elongate, oblique, in the triangular apertural face. 



Cretaceous to Recent. 



Genus CHRYSALIDINA d'Orbigny, 1839 



Plate 36, figure 17; plate 37, figure 15 

 Genoholotype, Chrysalidina gradata d'Orbigny 



Chrysalidina d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, vol. 

 5, 1839, "Foraminiferes", p. 107. 



Test elongate, tapering, broadest near the apertural end, tri- 

 serial, chambers more or less globular; wall arenaceous, thick; 

 aperture in the adult, cribrate, consisting of a series of small 

 rounded openings on the middle portion of the apertural face. 



Cretaceous to Recent. 



