96 FORAMINIFERA OF THE CRAG. 



35, 36 — 38, and pi. xxxvi, figs. 1 — 3, variously named by Reuss in the ' Sitzungsb. 

 k. Ak. Wiss. Wien,' vol. Ixii, 1870, page 464. 



Another group, having its most globose form with a transverse aperture in a 

 somewhat projecting mouth, passes into forms with more contracted aperture, 

 thus resenibling B. inornata, d'Orb., in the rounded and projecting aperture. 

 These are shown in — 



BiLocuLiNA BTJLiiOiDES, d'Orb., var. TEUNCATA, iJcKs*, 1867. Sitzungsb. k. Akad. 



Wiss. Wien, vol. Iv, p. 69, pi. ii, fig. 1. 



— — — var. TETJNCATA-GEACILIS, Beuss. Ibid., fig. 2. 



— LAETATA, Reuss, 1867. Ibid., vol. Iv, p. 70, pi. ii, fig. 3. With this 



last form the following nearly corresponds ; 



— TENUIS, Karrer, 1868. Ibid., vol. Iviii, p. 133, pi. i, fig. 5. 



As examples of differences we may remark that in pi. xv, ' Bull. Soc. G^ol. 

 France,' 1887, M. Schlumberger gives B. ringens (from the Paris Tertiaries) with a 

 subcircular aperture, and B. bulloides (from Grignon) with a low subcircular 

 aperture and a simply forked tongue. 



Occurrence. — Biloculina ringens is common in every sea, and at all depths to 

 nearly 3000 fathoms. It occurs in the Upper Jurassic (Karrer), and the Eocene 

 of the Paris Basin. It is common in Tertiary formations generally. In the 

 Coralline Crag of Sutton the species is not uncommon, and it occurs rarely in 

 other exposures of the same formation and in the Red Crag. 



2. Biloculina elongata, d^Orbigny, 1826. Plate III, fig. 28 (end view shows the 

 aperture), and Plate VI, figs. 1 a, h. Part 1, 1866, page 6, footnote. 



Biloculina elongata, d'Orb., 1826. Ann. Sci. Nat., vol. vii, p. 298. 



MiLiOLA (Biloculina) elongata, Parher and Jones, 1865. Phil. Trans., vol. civ, 



p. 409, pi. xvii, fig. 88 (not 90 and 91 = 

 another var. oi B. bulloides). 



Biloculina elongata, Parher, Jones, and Brady, 1871. Ann. Mag. Nat. Hist., 



ser. 4, vol. viii, p. 247, pi. viii, fig. 6. 



— — Terquem, 1882. Mem. Soc. Geol. France, ser. 8, vol. ii, 



p. 154, pi. xvi (sxiv), fig. 1. 



— — Brady, 1884. Eeport ' Challenger,' p. 144, pi. ii, fig. 9 



(synonymy). 



— — Fornasini, 1886. Boll. Soc. Geol. Ital., vol. v, pp. 218 



(with synonymy) and 271. 



— — Brady, Parker, and Jones, 1888. Trans. Zool. Soc, 



vol. xii, p. 214, pi. xl, figs. 21, 22. 

 MiLipLiNA elongata, Ooes, 1889. Bihang k. Svensk. Vet.-Akad. Handl., vol. xv, 



part 4, No. 2, p. 14, pi. ii, fig. 12. 



