FORAMIXIFERA OF THE NORTH PACIFIC OCEAN. 5 



Genus GLOBIGERINA d'Orbigny, 1826. 



Globigerina d'Orbigny (type, G. bulloidcs d'Orbigny) Ann. Sci. Nat., vol. 7, 

 1826, p. 277.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 589. 



Description. — Test composed of subglobular, inflated chambers, 

 variously arranged, in the early stages at least in a coiled form either 

 planospiral or trochoid; wall typically coarsery perforate, reticu- 

 late; aperture large, arched, at the base of the inner margin of the 

 chamber, in some species more than one aperture. 



This genus, comprising numerous well distinguished species, makes 

 up the large proportion of the pelagic group of the Foraminifera and 

 is the great constituent of Globigerina ooze. The range of structure 

 and method of development of the test is remarkable and under the 

 microscope the reticulated surface, combined with the curves of the 

 sutures and the spherical chambers, make the various members of 

 this genus very beautiful and interesting. It is remarkable that sev- 

 eral of the largest and now best known and most abundant of the 

 species should not have been known until the Challenger expedition, 

 but it is all the more to the credit of that pioneer work in the deep 

 water of the oceans. The form and surface structure of Globigerina 

 is so distinctive that its members are easily distinguished from any 

 other genus, unless perhaps it may be Candeina or Hastigerina, but 

 these have then own distinctive characters, as will be noted. 



The larger part of the figures illustrating the various species of 

 Globigerina are from photographs taken at the United States National 

 Museum and for the most part having a magnification of X35 unless 

 otherwise noted. These show well the general characters of the 

 species. 



GLOBIGERINA BULLOIDES d'Orbigny. 



Plate 2, figs. 7-9; plate 9. 



Globigerina bulloides d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 277, No. 1; 

 Modeles, No. 17 and No. 76; Foram. Voy. Amer. Merid., 1839, p. 37; in 

 Barker, Webb, and Berthelot, Hist. Nat. lies Canaries, 1839, pt. 2, Forami- 

 niferes, p. 132, pi. 2, figs. 1-3, 28; Foram. Foss. Bass. Tert. Vienne, 1846, 

 p. 163, pi. 9, figs. 4-6. — Parker and Jones, Ann. Mag. Nat. Hist., ser. 2, 

 vol. 19, 1857, p. 291, pi. 11, figs. 11, 12.— Williamson, Rec. Foram. Great 

 Britain, 1858, p. 56, pi. 5, figs. 116-118.— Stache, Vorara-Exped., Geol. 

 Theil, vol. 1, 1864, p. 286, pi. 24, figs. S5a-d.— Parker, Jones, and H. B. 

 Brady, Ann. Mag. Nat. Hist,, ser. 3, vol. 16, 1865, p. 21, pi. 2, fig. 56; p. 31, 

 pi. 2, fig. 55.— Terquem, Mem. Soc. Geol. France, ser. 3, vol. 2, 1882, p. 85, 

 pi. 9 (17), figs. 2a, 6.— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 19, 

 1882, p. 90, pi. 6, figs. 195-207.— Woodward and Thomas, 13th Ann. Rep. 

 Geol. Nat. Hist. Surv. Minnesota for 1884 (1885), p. 172, pi. 3, fig. 3.— H. B. 

 Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 593, pi. 77; pi. 79, 

 figs. 3-7. — H. B. Brady, Parker, and Jones, Trans. Zool. Soc, vol. 12, 

 1888, p. 225. pi. 45, fig. 15. — Burrows, Siierborn, and Bailey, Journ. Roy. 

 Micr. Soc, 1890, p. 561, pi. 11, fig. 17.— Woodward and Thomas, Geol. Nat. 



