100 FORAMINIFERA OF THE CRAG. 



BiLocuLiNA DEPEESSA, Munier-Chalmas and ScJilumherr/er, 1883. Compt. Eend., 



vol. xcvi, p. 864, figs. 1 and 2 ; 

 and Ann. Mag. Nat. Hist., ser. 5, 

 vol. xi, p. 338, figs. 1 and 2 ; and 

 1885, Bull. Soe. Geol. Trance, 

 ser. 3, vol. xiii, pp. 278, 280, figs. 

 4, 5, and 5 bis. 



— — Schlumberger, 1884. Assoc. Sci. Prance, Congres Rouen, 



1883, pp. 522—525, figs. 3—8. 



— — Brady, H'd^. Report "Challenger," p. 145 (with synonymy), 



pi. ii, figs. 12, 15—17 ; pi. iii, figs. 1, 2 

 (Brady's fig. 15 is Fornasini's " B. Bradyi," 

 Boll. Soc. Geol. ItaL, vol. v,1886, p. 261). 



— — Fornasini, 1886. Boll. Soc. Geol. ItaL, vol. v, p. 261. 



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



vol. xii, p. 213, pi. xl,figs. 17, 18. 

 MiLioLiNA DEPKESSA, Qoes, 1889. Bihang k. Svensk. Vet.-Akad. Handl., vol. xv, 



part 4, No. 2, p. 14, pi. ii, figs. 15, 16. 

 BiLocuLiNA DEPEESSA, Schlumberger, 1891. Mem. Soc. Zool. France, vol. iv, p. 547, 



cuts 1 — 5, pi. ix, figs. 48, 49. 



— — Mgger, 1893. Abhandl. k. Bayer. Akad. Wiss., vol. xviii, 



abth. 2, p. 220, pi. i, figs. 4—6. 



— — de Amicis, 1893. Boll. Soc. Geol. Ital., vol. xii, fasc. 3, 



pp. 17, 178, 179, 307. 



— — Goes, 1894. K. Svensk. Akad. Handl., vol. xxv. No. 9, 



p. 120, pi. xxv, figs. 921—925. 



Characters. — This is essentially a depressed variety of B. ringens, having its 

 opposite faces much less convex than in the type. The chambers become 

 flattened at the edge into a keel, which is often exaggerated into a broad, thin 

 lamina,^ sometimes crenulate.'* 



Some depressed Bilocidinae have the aperture somewhat contracted, and in this 

 respect approach B. bulloides. Brady's figs. 15 and 16, in pi. ii, Rep. ' Ohall.,' 

 show such passage-forms. 



Occurrence. — Biloculina depressa. — The geographical range of this species is 

 co-extensive with that of B. ringens. Geologically it occurs in the Eocene, London 

 Clay and Bracklesham Beds, in the Miocene of Vienna and Muddy Creek, Victoria, 

 in the Diestian and Casterlian of Antwerp, and in the Tertiaries of Malaga and 

 Piedmont. In addition to the occurrence at Sutton recorded in Part I of this 

 Monograph, we find this species, but rarely, at Broom Hill (zone d). 



1 As "Williamson's B. ringens, var. carinata, figs. 172 — 174, p. 79, ' Eec. Br. Foram.,' 1858. 

 ^ As GoiJs's M. ringens, pi. x, fig. 361, p. 131, ' Svensk. Akad.,' 1882. 



