252 FORAMINIFERA 



Sagrina (part) of authors. 

 Siphogenerina (part) of authors. 



Test elongate, somewhat compressed, in the young biserial, 

 in the adult uniserial; wall calcareous, finely perforate; aper- 

 ture in the adult terminal, rounded, with a slight lip and internal 

 tube. 



Tertiary and Recent. 



Genus LOXOSTOMUM Ehrenberg, 1854 

 Plate 36, figures 9-11; plate 37, figure 9 



Genotype, by designation, Loxostomuyn suhrostratum Ehrenberg 



Loxostomum EHRENBERG, Mikrogeologie, 1854, pi. xxvii, fig. 19. 

 Proroporus of authors (not Ehrenberg, 1844). 

 Boliviyia (part) of authors. 



Test elongate, usually compressed, early portion often slightly 

 twisted, early chambers biserial with the aperture as in Bolivina 

 reaching to the previous chamber but in the adult tending to 

 become uniserial and the aperture failing to reach the base of 

 the chamber, finally becoming terminal. 



Cretaceous to Recent. 



Genus TUBULOGENERINA Cushman, 1927 

 Plate 55, figures 3-5 

 Genoholotype, Textularia (Bigenerina) tubulifera Parker and Jones 

 Tubulogenerma Cushman, Contr. Cushman T.ab. Foram. Res., vol. 2, 



1927, p. 78. 

 Textularia (part) of authors. 

 Bigenerina (part) of authors. 

 Clavulina (part) of authors. 



Test with the early chambers biserial, later ones uniserial, 

 compressed or rounded in transverse section; wall often with 

 numerous tubuli extending out from the test, either open or 

 closed, forming lobular connections with the chamber, wall 

 calcareous; aperture elongate, narrow, or in the adult with 

 numerous rounded openings in the terminal face, the interior 

 of the chambers at least in some species with a curved structure 

 from roof to floor in the biserial portion. 



Cretaceous to Miocene. 



