32 



BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



posterior margin; wall calcareous, finely perforate, and ornamented 

 in the early part of the test with a few irregular costae, later with a 

 network of raised lines formed by the projecting processes extending 

 more or less across the face of each chamber; aperture bolivine, 

 elongate-oval ; color white. Length, up to 0.45 mm. ; breadth, 0.40 mm. 

 This species occurred at three Albatross stations in this Pacific 

 material, as listed in table 15. 



BOUVINA VARIABIUS (Williamson) 



Plate 9, Figure 3 



Texlularia variabilis Williamson, Rec. Foram. Great Britain, p. 76, pi. 6, figs. 

 162, 163, 1858. 



Bolivina variabilis Chaster, 1st Rep. Southport Soc. Nat. Sci., pp. 59, 69, 1890- 

 1891 (1892). — Heron-Allen and Earland, Journ. Roy. Micr. Soc, 1909, 

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

 Micr. Soc, 1916, p. 43; Trans. Linn. Soc. London, ser. 2, vol. 11, p. 240, 

 1916.— CusHMAN, U. S. Nat. Mus. Bull. 104, pt. 3, p. 49, pi. 4, figs. 3a, b, 

 1922. — Heron-Allen and Earland, Journ. Roy. Micr. Soc, 1930, p. 81. — 

 Ctjshman, Cushman Lab. Foram. Res. Special Publ. No. 9, p. 158, pi. 16, 

 figs. 6, 12-14, 1937. 



Test of the early portion somewhat compressed, later more inflated, 

 periphery rounded but toward the apertural end occasionally some- 

 what compressed at the margin, even appearing carinate, the width 

 increasing very gradually toward the apertural end; early chambers 

 low, close set, not inflated, later ones high and more inflated ; sutures 

 of the early portion slightly limbate, later becoming depressed and 

 somewhat sigmoid; waU smooth but very coarsely perforate; aperture 

 elongate, slightly loop-shaped, at the base of the inner margin of the 

 last-formed chamber. Length, up to L30 mm.; breadth, 0.45 mm.; 

 thickness, 0.20 mm. 



The species is abundant in Niau Lagoon and rare off Fiji, 40-50 

 fathoms, and rare also at Vavau Anchorage, Tonga Islands. There 



Table 16. — Bolivina variabilis — material examined 



