6 FORAMINIFERA OF THE CRAG. 
Biloculina ringens is common in almost every sea, abounding all round our own 
islands. We find it, with most of the other A/i/ole, in Tertiary deposits, but not reaching 
further back than the Eocene beds of the Paris Basin. We find it rare in the Upper 
Crag, together with its variety B. elongata; but in the Sutton Crag it is large and 
common; and many of the specimens have somewhat narrow but ventricose chambers 
(fig. 28), tending towards the variety known as B. contraria. 
Biloculina contraria, D’Orb., which is one of the extreme varietal forms of B. ringens, 
is figured in the ‘ For. Fos. Vien.,’ p. 266, pl. 16, figs. 4—6; and by Brady, ‘Trans. 
Linn. Soc.,’ vol. xxiv, p. 246, pl. 48, fig. 2. Some of the sub-varieties, which, like Plate ITI, 
fig. 28, form passages between it and B. ringens, are— 
Biloculina opposita, Deshayes, 1831. Coq. Caract. Tert., pp. 252, 259, pl. 3, figs. 8-10; Morris’s 
Cat. Brit. Foss., 1843, p. 61; and 2nd edit., 1854, p. 61. 
— oblonga, D’Orb., 1839. Foram. Cuba, p. 163, pl. 8, figs. 21-23. : 
— Patagonica, Id., 1839. Foram. Amér. Mér., p. 65, pl. 3, figs. 15-17. 
— irregularis, Id., 1839. Ibid., p. 67, pl. 8, figs. 20, 21. 
== Bougainvillei, 1d., 1839. Ibid., figs. 22-24. 
— affinis, Id., 1846. For. Fos. Vien., p. 265, pl. 16, figs. 1-3. 
2. Brnocunina DEpPRESSA, D’Orbigny. Plate III, figs. 29, 30. 
BILocuLINA DEPRESSA, D’Orb., 1826. Modéle No. 91; Ann. Sc. Nat., vol. vit, p. 298, 
No. 1. 
— caRtnata, Id., 1839. For. Cuba, p. 148, pl. 8, fig. 24 ; pl. 9, figs. 1, 2. 
— LUNULA, Id., 1846. For. Fos. Vien., p. 264, pl. 15, figs. 22—24. 
os uMBoNnatTa, Wood, 1843. Morris’s Catal. Brit. Foss., Ist edit., p. 61. 
—_ AMPHICONICA, Reuss, 1850. Denks. Akad. Wien., vol. i, p. 382, pl. 49, 
fig. 5, 
— RINGENS, var. CARINATA, Williamson, 1858. Rec. Foram. Gt. Brit., p. 79, 
pl; 7, figs: ¥72—174: 
Mittoxa (Bitocurrna) DupRessa, Parker and Jones, 1865. Phil. Trans., vol. clv, p. 409, 
pl. 17, figs. 89,a, 89,6. 
Characters.—Similar to the typical form B. ringens, but differmg in the more 
flattened shape of the chambers. Shell lenticular; margin sharp and carinate. Length, 
2th inch. 
Biloculina depressa is found in company with the typical B. rzmgens, wherever the 
latter occurs. The only specimens we have from the Crag are those in Mr. Searles Wood’s 
gatherings from Sutton. 
