FORAMINIFERA OF THE ATLANTIC OCEAIST. 37 



9-11.— Wright, Ann. Mag. Nat. Hist., vol. 4, ser. 6, 1889, p. 449.— 

 Pearcey, Trans. Glasgow Nat. Hist., Soc, vol. 2, 1890, p. 178. — Bur- 

 rows, Sherborn, and Bailey, Journ. Roy. Micr. Soc, 1890, p. 562, 

 pi. 11, figs. 20, 21.— Wright, Proc. Roy. Irish Acad., ser. 3, vol. 1, 1891, 

 p. 489. — FoRXAsiNi, Mem. Accad. Sci. 1st. Bologna, ser. 5, vol. 3, 

 1893, p. 430, pi. 2, fig. 13.— Egger, Abh. kon. bay. Akad. Wiss. Miinchen, 

 CI. II, vol. 18, 1893, p. 375, pi. 13, figs. 48, 49.— Goes, Kongl. Svensk. 

 Vet. Akad. Handl., vol. 25, 1894, p. 87, pi. 14, fig. 770.— Chapman, 

 Proc. Zool. Soc. London, pt. 1, 1895, p. 38. — Goes, Bull. Mus. Comp. 

 ZooL, vol. 29, 1896, p. 67.— FlixNT, Rep. U. S. Nat. Mus., 1897 (1899), 

 p. 325, pi. 71, fig. 1. — Chapman, Quart. Journ. Geol. Soc, vol. 54, 

 1898, p. 555. — MiLLETT, Journ. Roy. Micr. Soc, 1903, p. 692.— Chap- 

 man, Trans. New Zealand Inst., vol. 38, 1905, p. 101. — Earland, 

 Journ. Quekett Micr. Club, ser. 2, vol. 9, No. 57, 1905, p. 219.— Bagg, 

 Proc U. S. Nat. Mus., vol. 34, 1908, p. 155.— Sidebottom, Mem. 

 Proc Manchester Lit. Pliilos. Soc, vol. 52, No. 13, 1908, p. 5, pi. 1, 

 fig. 11. — Chapman, Subantarctic Ids. New Zealand, 1909, p. 351; 

 Journ. Linn. Soc. Zool., vol. 30, 1910, p. 418; Zool. Res. "Endeavour," 

 pt. 3, 1912, p. 311.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 4, 1914, 

 p. 18, pi. 10, fig. 7; pi. 12, fig. 1. — Sidebottom, Journ. Roy. Micr. Soc, 

 1918, p. 151.— Cushman, Proc. U. S. Nat. Mus., vol. 56, 1919, p. 622; 

 Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 297. 



Description. — Test subspherical, the exterior usually formed by 

 the last three chambers, entirely corering the earlier chambers, 

 which are irregularly spiral; sutures very slightly depressed; wall 

 smooth and polished, thick, minutely perforate; aperture compara- 

 tively small, consisting of an arched semicircular opening, usually 

 nearly closed by a broad flat semicircular tooth. 



Diameter up to about 1 mm. 



Distribution. — While specimens of this species occur in the Albatross 

 dredgings from the coast of Brazil to the latitude of Cape Cod, the main 

 distribution seems to be near the latter locality. There are scattered 

 specimens, as the table shows from off Brazil, the Caribbean, and 

 the Gulf of Mexico; but the great mass of records are in the region 

 between Cape Hatteras and Cape Cod, on the northeastern coast of 

 the United States. 



The species is apparently not known as a pelagic one. While it has 

 in general a spherical form, there are no secondary openings and the 

 single aperture is nearly closed by a large flat tooth. This does not 

 correspond with the character of free accessibility of the protoplasm 

 to the surface seen in most pelagic species. 



