72 



BULLETIN" 10 4, UNITED STATES NATIONAL MUSEUM 



ScHLUMBERGER, Mem. Soc. G6ol. France, vol. 4, 1891, p. 165, pi. 9, figs 

 52, 54, figs. 8, 9 in text. — Egger, Abhandl. kon. bay. Akad. Wiss. Mtinchen 

 CI. II, vol. 18, 1893, pi. 1, figs. 19, 20.— Goes, Bull. Mus. Comp. Zool. 

 vol. 29, 1896, p. 87. — Schubert, Abhandl. geol. k. k. Reichs., vol. 20, 1911 

 p. 122, text fig. 17. — Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 1914 

 p. 994.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 19, text fig 

 25; p. 75, pi. 28, fig. 3; pi. 29, fig. 1; Bull. 100, U. S. Nat. Mus., vol. 4 

 1921, p. 470; Bull. Scripps Instit. Oceanography, Tech. Ser., vol. 1, 

 1927, p. 140. 

 Biloculina depressa d'Orbigny, var. murrhyna H. B. Brady, Rep. Voy. 

 Challenger, Zoology, vol. 9, 1884, p. 146, pi. 2, figs. 10, 11.— J. Wright, 

 Proc. Roy. Irish Acad., ser. 3, vol. 1, 1891, p. 462. — Chapman, Proc. Zool. 

 Soc. London, 1895, p. 7. — Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 

 117. — Chapman, Journ. Linn. Soc. Zool., vol. 30, 1910, p. 395; Zool. Res. 

 Endeavour, pt. 3, 1912. p. 310; Biol. Res. Endeavour, vol. 3, pt. 1, 1915, 

 p. 5. — SiDEBOTTOM, Journ. Roy. Micr. Soc, 1918, p. 3. — Heron-Allen 

 and Earland, British Antarctic Exped., Zool., vol. 6, 1922, p. 62. 



Test in front view, in young specimens, nearly circular, in adult 

 specimens somewhat longer than broad, in end view ellipsoid, with 

 the borders extended and carinate, the carina interrupted at the point 

 opposite the aperture, leaving a sinus, rather deep and often with a 

 long spine at each angle in young specimens ; in adults, sinus less deep, 

 and the spines usually reduced or wanting; wall smooth; aperture 

 in the young with a neck not exceeding the periphery of the test; in 

 adults with a prominently exserted tubular neck with a bifid tooth 

 partially filling the nearly circular opening; wall smooth. 



Diameter up to 1.5 mm.; thickness, 0.50 mm. 



This is a deep-water species and is very widely distributed in all 

 the ocean basins. There are comparatively few previous records 

 from the Atlantic. 



Pyrgo rmirrhina — material examined 



