FORAMINIFERA OF THE ATLANTIC OCEAN. 



11 



GLOBIGERINA DIGITATA H. B. Brady. 



Plate 2, figs. 9-11. 



Glohigerina digitala H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, 

 p. 72; Rep. Voy. Challenger Zoology, vol. 9, 1884, p. 599, pi. 80, figs. 

 6-10; pi. 82, figs. 6, 7. — Terrigi, Mem. Accad. Nuovi Lincei, ser. 4, 

 vol. 6, 1889, p. 113, pi. 6, fig. 13.— Egger, Abh. kon. bay. Akad. Wiss. 

 Miinchen, CI. II, vol. 18, 1893, p. 369, pi. 13, figs. 25, 60, 61.— Chap- 

 man, Proc. Zool. Soc. London, pt. 1, 1895, p. 37. — Flint, Rep. U. S. 

 Nat. Mus., 1897 (1899), p. 323, pi. 70, fig. 2.— Chapman, Journ. Linn. 

 Soc. Zool., vol. 28, 1901, p. 404.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 

 1908, p. 153.— Chapman, Journ. Linn. Soc. Zool., vol. 30, 1910, p. 417. — 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 4, 1914, p. 7, pi. 14, figs. 1-3.— 

 Pearcey, Trans. Roy. Soc. Edinb., vol. 49, 1913, p. 1025. — Sidebottom, 

 Journ. Roy. Micr. Soc, 1918, p. 150.— Cushman, Bull. 100, U. S. 

 Nat. Mus., vol. 4, 1921, p. 288. 



Description: — Test regularly spiral, trochoid, consisting of two or 

 three volutions; early chambers inflated, subspherical, later chambers 

 much elongated, the tip usually rounded; wall reticulate; aperture 

 opening into the central umbilical opening; or in the elongate, adult 

 chambers making up the larger part of the base of the chamber, 

 the area of attachment being very much reduced. 



Diameter of single Atlantic specimen slightly less than 1 mm. 



Distribution. — This seems to be typically a species of the Pacific and 

 Indian Oceans. Brady in the Challenger report recorded it from 

 three stations in the South Atlantic. Flint recorded a single specimen 

 from the Gulf of Mexico, Albatross station D2377, and I have another 

 specimen from this same material. It is therefore very rare in the 

 North Atlantic. 



Glohigerina digitata — material examined. 



GLOBIGERINA DUTERTREI D'Orbigny. 



Glohigerina duterirei D'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 

 1839, "Foraminiferes," p. 95, pi. 4, figs. 19-21.— H. B. Brady, Rep. 

 Voy. Challenger, Zoology, vol. 9, 1884, p. 601, pi. 81, figs. 1 a-c. — 

 Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 55, pi. 12, fig. 7; 

 Publ. 311, Carnegie Inst. Washington, 1922, p. 36, pi. 5, figs. 8, 9. 



Description. — Test rotaliform, generally rounded, very convex on 

 the ventral side, the last coil usually consisting of five chambers; 

 chambers gradually increasing in size, the later ones much inflated; 

 60278—24 2 



