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 Miliolce, 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. confraria. 



Biloculma contraria, D'Oi"b., which is one of the extreme varietal forms of B. ringens, 

 is figured in the 'For. Fos. Vien.,' p. 266, pi. 16, figs. 4 — 6; and by Brady, 'Trans. 

 Linn. Soc.,' vol. xxiv, p. 246, pi. 48, fig. 2. Some of the sub-varieties, which, like Plate III, 

 fig. 2 8, form passages between it and B. ringens, are — 



Biloculina opposita, Deshayes, 1831. Coq. Caract. Tert., pp. 252, 259, pi. 3, figs. 8-10; Morris's 

 Cat. Brit. Foss., 1843, p. 61 ; and 2nd edit., 1854, p. 61. 



— oblunffa, D'Orb., 1839. Foram. Cuba, p. 163, pi. 8, figs. 21-23. 



— Patagonica, Id., 1839. Foram. Am6r. Mer., p. 65, pi. 3, figs. 15-17. 



— irregularis, U.,\Si9. Ibid., p. 67, pi. 8, figs. 20, 21. 



— Bougainvillei,lA.,\SQ9. Ibid., figs. 22-24. 



— ff#«is. Id., 1846. For. Fos. Vien., p. 265, pi. 16, figs. 1-3. 



2. Biloculina depress a, D'Orbigng. Plate III, figs. 29, 30. 



Biloculina. DEPKESSA, D'Orb., 1826. Modde No. 91; Ann. Sc. Nat, vol. vii, p. 298, 

 No. 1. 



— CAKINATA, Id., 1839. For. Cuba, p. 148, pi. 8, fig. 24 ; pi. 9, figs. 1 , 2. 



— LUNULA, Id., 1846. For. Fos. Vien., p. 264, pi. 15, figs. 22—24. 



— UMBONATA, Wood, 1843. Morris's Catal. Brit. Foss., 1st edit., p. 61. 



— AMPHICONICA, Reiias, 1850. Denks. Akad. Wien., vol. i, p. 382, pi. 49, 



fig. 5. 



— EINGENS, var. CARINATA, Williamson, 1858. Rec. Foram. Gt. Brit., p. 79, 



pi. 7, figs. 172—174. 

 MiLiOLA (Biloculina) depeessa, Parker and Jones, 1865. Phil. Trans., vol. civ, p. 409, 



pi. 17, figs. 89, a, 89,6. 



Characters. — Similar to the typical form B. ringens, but differing in the more 

 flattened shape of the chambers. Shell lenticidar ; margin sharp and carinate. Length, 

 5^th inch. 



Biloculina depressa is found in company with the typical B. ringens, wherever the 

 latter occiu"s. The only specimens we have from the Crag are those in Mr. Searles Wood's 

 gatherings from Sutton. 



