TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 63 



In size it is similar to Globigerinoides ruber but differs in its flattened 

 chambers and its consequently compact and inconspicuous spire. In 

 its rough wall surface and in the flattening of its chambers, it is similar 

 to 67. conglobatus but from this species it is distinguished easily by its 

 high-arched apertures and its significantly smaller size. The height 

 of its spire is variable and, as Banner and Blow (1960a, p. 13) have 

 pointed out, is probably of neither taxonomic nor stratigraphic value. 

 What characterizes the species is the appearance of asymmetry in the 

 position of the aperture, the asymmetry being a result of the flattening 

 of the chambers. 



GLOBIGERINOIDES RUBER (d'Orbigny) 



Plate 25, Figure 6 



Globigerina rubra d'Orbigny, 1839, in De la Sagra, Hist. Physiq. Pol. Nat. 

 Cuba, Foraminiferes, p. 82, pi. 4, figs. 12-14. — Banner and Blow, 1960, 

 Contr. Cushman Found. Foram. Res., vol. 11, p. 19, pi. 3, fig. 8. 



Globigerinoides rubra (d'Orbigny). — Cushman, 1945, Contr. Cushman Lab. 

 Foram. Res., vol. 21, p. 75, pi. 12, figs. 6, 9. — Bradshaw, 1959, Contr. Cush- 

 man Found. Foram. Res., vol. 10, p. 42, pi. 7, figs. 12, 13. 



This species, like most of the planktonics, is also a cosmopolitan 

 one in the warmer waters of the oceans. It is found in many of the 

 samples studied but is usually not very common. 



It is characterized by a spinose rather than cancellated wall, by 

 rounded rather than flattened chambers, and by high-arched and 

 symmetrically placed apertures. Its spire is variable in height, and 

 its average size is relatively smaller than the other species in this 

 genus : Globigerinoides sacculifer, G. conglobatus, and 67. elongatus. 



GLOBIGERINOIDES SACCULIFER (Brady) 



Plate 26, Figure 4 



Globigerina sacculifera Brady, 1884, Rep. Voy. Challenger, Zoology, vol. 9, p. 604> 

 pi. 80, figs. 11-17; pi. 82, fig. 4.— Banner and Blow, 1960, Contr. Cushman 

 Found. Foram. Res., vol. 11, p. 21, pi. 4, figs. 1, 2. 



Globigerinoides sacculifer (Brady). — Bradshaw, 1959, Contr. Cushman Found. 

 Foram. Res., vol. 10, p. 42, pi. 7, figs. 14, 15, 18. 



One of the best-known and most easily recognized of the cosmo- 

 politan planktonic species, Globigerinoides sacculifer is found in most 

 of the samples studied and is common to abundant in most of them. 

 Specimens are typical, having the distinctive cancellated surface by 

 which this species is best recognized. In samples where the species 

 is abundant, individual specimens can be found that are representative 

 of nearly every degree of development in this species. Moreover, 

 because of its open coiling, one can observe clearly what the appear- 

 ance of any individual specimen would have been before its last, its 

 penultimate, its third-from-last, its fourth-from-last, etc., chamber 

 was added. In so doing, one sees the sequence from Globigerinoides 



