FAMILY 39. GLOBIGERINIDAE ,307 



Test in the early stages like Globigerina, later developing a 

 globular chamber entirely enclosing the earlier ones, which may 

 be later resorbed ; wall calcareous, often of several layers, with 

 perforations of various sizes, no general aperture, exterior with 

 fine elongate spines. 



Tertiary and Recent. 



Although there are references to "Orbulina" in the literature 

 which would indicate its presence early in the fossil series, those 

 from the Cambrian are certainly erroneous, and it is to be 

 suspected that those from the formations before the Tertiary 

 are not truly Orbulina. I am inclined to agree with Earland 

 that the so-called larger aperture of Orbulina is an accidental 

 opening and not a true aperture. Orbulina is an end form and 

 represents probably the complete attainment of a spherical test 

 adapted for pelagic life. 



Subfamily 3. Pulleniatininae 



Test in tne early stages trochoid and like Globigerina, later 

 becoming involute and the later chambers covering the earlier 

 ones ; test without spines in the adult ; wall coarsely porous. 



Genus PULLENIATINA Cushman, 1927 



Plate 47, figures 11-13; plate 48, fig-ure 5 

 Genoholotype, Pullenia obliqnilocnlata Parker and Jones 

 Pulleniatina Cushman, Contr. Cushman Lab, Forani. Res., vol. 3, 1927, 



p. 90. 

 Pullenia (part) of authors. 



Test with the early chambers as in Globigerma, with the wall 

 cancellated and apparently with spines, later with the chambers 

 coarsely perforate, but smooth, except about the aperture, the 

 chambers involute, the last three or four forming the outer 

 surface of the test, without spines in the adult; aperture 

 elongate, arched, at the base of the chamber. 



Late Tertiary and Recent. 



