FORAMINIFERA OF THE ATLANTIC OCEAN. 49 



BOLIVINA TORTUOSA Brady. 



Plate 9, fig. 5. 



Bolivina tortuosa H. B. Brady, Quart. Journ. Micr. Soc, vol. 21, 1881, p. 57; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 420, pi. 52, figs. 31-34.— 

 Egger, Abh. kon. bay. Akad. Wiss. Munchen, CI. II, vol. 18, 1893, p. 298, 

 pi. 8, figs. 43, 44.— MiLLETT, Journ. Roy. Micr. Soc, 1900, p. 543. — Chapman, 

 Journ. Linn. Soc. Zool., vol. 28, 1900, p. 187; 1902, p. 382.— Earland, Journ. 

 Quekett Micr. Club, eer. 2, vol. 9, 1905, p. 209.— Heron-Allen and Ear- 

 land, Journ. Roy. Micr. Soc, 1908, p. 317, pi. 10, figs. 3, 4. — Sidebottom, 

 Mem. Proc Manchester Lit. Philos. Soc, vol. 54, pt. 3, 1910, p. 13. — Heron- 

 Allen and Earland, Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 66, 

 pi. 5, fig. 1; Journ. Roy. Micr. Soc, 1916, p. 43; Trana. Linn. Soc. Zool., 

 eer. 2, vol. 11, 1916, p. 240.— Sidebottom, Journ. Roy. Micr. Soc, 1918. p. 127. 



Description. — ''Test elongate, tapering, broadest near the apertu- 

 ral end; the margins bent obliquely towards the median line on 

 either side, so as to give to the entire shell a twisted contour; periph- 

 eral edge thin, sharp, lobulated. Segments numerous; long and nar- 

 row; the later ones projecting and rounded at the peripheral ends. 

 Shell conspicuously perforated." 



"Length, l/60th inch (0.42 nmi) more or less." 



Distribution. — Brady figures two forms in the Challenger Report, 

 one a shorter broader form from the South Pacific, and a larger, 

 more tapering form from the Cape Verde Islands in shallow water. 

 Except for Sidebottom's records from the Mediterranean, most other 

 records are from either the region of the British Isles or from the 

 Indo-Pacific. It does not occur as far as I have seen in the western 

 Atlantic. 



bolivina variabilis (WilUamson). 



Plate 4, fig. 3. 



Textularia variabilis {typica) Willlamson, Rec Foram. Great Britain, 1858, p. 



76, pi. 6, figs. 162, 163. 

 Bolivina variabilis Chaster, First Report Southport Soc Nat. Sci., 1890-91 (1892), 



pp. 59, 69. — Heron-Allen and Earland, Journ. Roy. Micr. Soc, 1908, p. 



336; Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 68; Journ. Roy. Micr. 



Soc, 1916, p. 43; Trans. Linn. Soc Zool., ser. 2, vol. 11, 1916, p. 242. 



Heron-Allen and Earland distinguish this species in the region of 

 the British Isles where it seems to be abundant. 



Genus PLEUROSTOMELLA Reuss, 1860. 



Nodosaria (part) Reuss, Verst. Bohm. Kried., pt. 1, 1845, p. 28. 

 DfiniaZma (part) Reuss, Haidinger'sNat. Abhandl., vol. 4, 1850, p. 24. 

 PleuTOstomella Reuss (type, P. subnodosa Reuss), Sitz. Akad. Wiss. Wien, vol. 40, 



1860, p. 203.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 



410.— Chapman, The Foraminifera, 1902, p. 174.— Cushman, Bull. 71, U. S. 



Nat. Mus., pt. 2, 1911, p. 49. 



Description. — ^Test elongate, somewhat compressed, composed of 

 numerous chambers, usually biserially arranged; wall calcareous. 



