^ BULLETIN 10 4, UNITED STATES NATIONAL MUSEUM 



from either side ; sutures somewhat indistinct ; wall calcareous, imper- 

 forate, covered on the exterior with fine arenaceous material; aperture 

 slightly exserted, nearly circular. 



Length, 0.8 mm.; breadth, 0.65 mm.; thickness, 0.20 mm. 



There are a very few records for this species in the Atlantic. Brady 

 records it from the Faroe Channel, and Brady, Parker, and Jones 

 record it from the Abrohlos Bank off Brazil. There are numerous 

 records for it in the fossil state and in the Indo-Pacific, but there is 

 such a wide range in the character of the specimens figured that they 

 should be restudied from the original specimens. 



SIGMOILINA SIGMOIDEA (H. B. Brady) 



Plate 11, Figures 5, 6 



Planispirina sigmoidea H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 197, pi. 2. figs. 1-3, text fig. 5c. — Schlumberger, Bull. Soc. Zool. 

 France, vol. 12, 1887, p. 106, pi. 7, figs. 9-11, text figs. 1-5.— H. B. Brady, 

 Parker, and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 216, pi. 40, fig. 

 16. — HowcHiN, Trans. Proc. Roy. Soc. So. Australia, vol. 12, 1889, p. 5. — 

 A. SiLVESTRi, Mem. Accad. Pont. Nuovi Lincei, vol. 9, 1893, p. 190. — 

 Egger (?), Abhandl. kon. bay. Akad. Wiss. Miinchen, CI. II, vol. 18, 1893, 

 p. 245, pi. 4, figs. 9, 10. — Woodward, The Observer, vol. 4, 1893, p. 77. — 

 Flint, Ann. Rep. U. S. Nat. Mus., 1897 (1899), p. 302, pi. 47, fig. 6.— 

 Heron-Allen and Earland, Trans. Linn. Soc. London, ser. 2, vol. 11, 

 1916, p. 216, pi. 39, figs. 32-34. — Sidebottom, Journ. Roy. Micr. Soc, 

 1918, p. 10. 



Sigmoilina sigmoidea Schlumberger, Bull. Soc. Zool. France, vol. 12, 1887, 

 p. 118. — Chapman, Proc Zool. Soc. London, 1895, p. 11. — Goiss, Bull. 

 Mus. Comp. Zool., vol. 29, 1896, p. 80. — Chapman, Journ. Linn. Soc. 

 Zool., vol. 30, 1907, p. 20, pi. 2, fig. 40; p. 398; Biol. Res. Endeavour, vol. 

 3, pt. 1, 1915, p. 11.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, 

 p. 61, pi. 24, figs. 2, 3; Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 448.— 

 Heron-Allen and Earland, British Antarctic Exped., Zool., vol. 6, 1922, 

 p. 71; Journ. Roy. Micr. Soc, 1924, p. 133. — Hanzawa, Jap. Journ. Gaol. 

 Pal., vol. 4, 1925 (1926), p. 37 (table).— Yabe and Hanzawa, Jap. Journ. 

 Geol. Pal., vol. 4, 1925 (1926), p. 49. 



Both this and the preceding species occur very widely distributed 

 and in fairly deep water. S. sigmoidea has a very smooth porcellanous 

 surface, usually glistening white with the sutures usually not visible 

 except in the young. There are records for the species off the British 

 Isles and off the northern border of the West Indies but in water of 

 several hundred fathoms with numerous scattered stations elsewhere 

 in the Atlantic always in water of considerable depth. 



Genus ARTICULINA d'Orbigny, 1826 



Articulina d'Orbigny (Genoholotype, Articulina nitida d'Orbigny), Ann. 

 Sci. Nat., vol. 7, 1826, p. 300.— H. B. Brady, Rep. Voy. Challenger, Zool- 

 ogy, vol. 9, 1884, p. 182.— Chapman, The Foraminifera, 1902, p. 93.— 

 CusHMAN, Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 150. 



Nautilus Batsch (not Linnaeus), Conch, des Seesandes, 1791, p. 3. 



Vertebralina (part) Parker, Jones, and H. B. Brady (not d'Orbigny), Ann* 

 Mag. Nat. Hist., ser. 3, vol. 16, 1865, p. 22 



