30 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



and show surprisingly little variation, at least in tropical and sub- 

 tropical regions. 



There is a tendency in the later development of certain species to 

 initiate a uniserial stage. The chambers instead of going only half- 

 way across the test extend to the opposite side and the aperture be- 

 comes terminal. Such species are referred to the subgenus Bifarina. 



BOLIVINA BEYRICHI Keuss. 



Plate 9, fig. 6. 



Bolivina beyrichi Reuss, Zeitschr. Deutsch. geol. Gesellsch., vol. 3, 1851, p. 83, 

 pi. 6, fig. 51. — HanTken, Mitth. Jahrb. Ung. geol. Anstalt, vol. 4, 1875 

 (1881), p. 64, pi. 7, fig. 11. — Terrigi, Atti Accad. Pont. Nuovi Lincei, vol. 

 33, 1880, p. 198, pi. 2, figs. 43-45; vol. 35, 1883, p. 191, pi. 3, fig. 33.— H. B. 

 Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 422, pi. 53, fig. 1.— 

 Egger, Abh. kon. .bay. Akad. Wiss. Miinchen, CI. II, vol. 18, 1893, p. 296, 

 pi. 8, figs. 24-26.— Chapman, Proc. Zool. Soc. London, 1895, p. 24.— Goes, 

 Bull. Mus. Comp. Zool., vol. 29, 1896, p. 47. — Jones and Chapman, Monogr. 

 Christmas Island, 1900, p. 231. — Heron-Allen and P^arland, Journ. Roy. 

 Micr. Soc, 1908, p. 334.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 2, 1911, 

 p. 34, fig. 56 (in text).— Bagg, Bull. 513, U. S. Geol. Survey, 1912, p. 

 40, pi. 10, fig. 10.— Chapman, Zool. Res. Endeavour, 1912, p. 310; 1915, p. 

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

 11, 1916, p. 239, pi. 41, fig. 15.— SiDEBOTTOM, Journ. Roy. Micr. Soc, 1918, 

 p. 126.— Cushman, Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 128. 



Description. — Test elongate, rather narrow, much compressed, 

 slightly tapering to the round-pointed apical end, apertural end 

 evenly rounded; chambers numerous, high at the posterior outer 

 edge, each projecting backward in a spinose projection; wall smooth, 

 punctate; aperture elongate; color white. 



Length slightly less than 1 mm. 



Distribution. — ^The only Atlantic stations given by Brady in the 

 Challenger Report are off the Canaries, 600 and 1,125 fathoms (1,097 

 and 2,057 meters). Heron-Allen and Earland record it from the 

 west of Scotland. There are numerous other records, mostly from 

 the Pacific. 



BOUVINA BEVRICHI Reuss, rar. ALATA (Seguenza). 



Plate 8, fig. 3. 



Vulvulina alata Seguenza, Atti Accad. Gioenia Sci. Nat., ser. 2, vol. 18, 1862, 



p. 115, pi. 2, figs. 5, 5a. 

 Bolivina alata Egger, Abh. kon. bay. Akad. Wiss. Miinchen, Cl. II, vol. 18, 



1893, p. 296, pi. 8, fig. 27. 

 Bolivina beyrichi Reuss, var. alata H. B. Brady, Rep. Voy. Challenger, Zoology, 



vol. 9, 1884, p. 422, pi. 53, figs. 2l-'4.— Bagg, Maryland Geol. Survey, Miocene, 



1904, p. 473, pi. 132, fig. 4. — Sidebottom, Mem. Proc Manchester Lit. 



Philos. Soc, vol. 54, pt. 3, 1910, p. 13.— Cushman, Bull. 71, U. S. Nat. 



Mus., pt. 2, 1911, p. 35, figs. 57a, b (in text).— Bagg, Bull. 513, U. S. Geol. 



Survey, 1912, p. 40, pi. 10, figs. 7-9.— Cushman, Bull. 676, U. S. Geol. 



Survey, 1918, p. 49.— Sidebotto^I, Journ. Roy. Micr. Soc, 1918, p. 126.— 



Cushman, Bull. 100. U. S. Nat. Mus., vol. 4, 1921, p. 129. 

 Bolivina beyrichi Rev ss, var. carinata Hantken, Magy. kir. foldt. int. ^vkonyve, 



vol. 4, 1875 (1876), pi. 7, fig. 12; Mitth. Jfeihrb. Ung. geol. Anstalt, vol. 4, 1875 



(1881), pi. 7, fig. 12. 



