FAMILY 31. BULIMINIDAE 243 



D. Aperture with a cylindrical neck and phialine lip. 



1. Triserial throughout. 



a. Test distinctly angled in section Angulogerina. 



b. Test rounded in section Uvigerina. 



2. Later stages uniserial. 



a. Test distinctly angled in section Trifarina. 



b. Test rounded in section Siphogenerina. 



III. Test uniserial throughout. 



A. Rounded in section throughout. 



1. Aperture cribrate . .Chrysalognnium. 



2. Aperture with a neck and phialine lip Sij)ho7iodosaria. 



3. Aperture irregular, sometimes at the side.. . . Sporadogenerina. 



B. Early stages angled, later rounded Dentalinopsis. 



IV. Test consisting of a single chamber with an internal tube and rounded 



terminal ajierture Entosolenia. 



V. Test biserial in the adult or at least in the early stages. 



A. Test biserial in the adult. 



1. Aperture comma-shaped, not in the median line Virgulina. 



2. Aperture in the median line, reaching the base of the cham- 



ber Bolivina. 



B. Test becoming uniserial in the adult, aperture terminal. 



1. Only the last chambers failing to be biserial, apertui'e usually 



broader at one end Loxostomum. 



2. Typically uniserial in the adult. 



a. Aperture single, terminal. 



(1). Chambers of the adult somewhat compressed, neck 

 very slightly if at all developed Rectobolivina. 



(2). Chambers not compressed in the adult, neck and lip 

 strongly developed Bifarina. 



b. Aperture cribrate or a circle of pores Tubidogcnerina. 



Subfamily 1. Terebralininae 



Test in an elongate, close spiral; not divided into chambers; 

 aperture rounded, subterminal. 



Genus TEREBRALINA Terquem, 1866 

 Plate 35, figure 6 ; plate 37, figure 1 



Genoholotype, Terebralina regnlaris Terquem. 



Terehralina Terquem, Sixieme Mem. Foram. Lias, 1866, p. 473. 



Test consisting of a proloculum and elongate undivided tubular 

 second chamber in an elongate close spiral ; wall calcareous, per- 

 forate; aperture rounded, terminal. 



Jurassic. 



