362 FORAMINIFERA OP THE CRAG. 



lapping, and are equally visible on both sides of the shell. Chambers numerous, 

 rapidly increasing in size. Aperture simple at the inner margin of the chamber, 

 as in Numrmdites, from which genus Operculina differs in its delicate and more 

 explanate shell, and more rapid increase of size in successive whorls. Canal 

 system well developed. 



1. Operculina complanata, Defmnce, 1822. Plate II, figs. 49, 50. 



Part I, 1866, Appendix I, Table Iso. 94; Appendix II, Table No. 93. 



Lenticulites complanata, Defrance, 1822. Diet. Sci. Nat., vol. xxv, p. 453. 



— — Basterot, 1825. Mem. Geol. Env. Bordeaux, pt. 1, 



p. 18. 

 Operculina complanata, cVOrbigny, 182G. Ann. Sci. Nat., vol. vii, p. 281, pi. xiv, 



figs. 7—10 ; Modele, No. 80. 



— — MicheJotti, 1841. Mem. Soc. Ital. Sci., vol. xxii, p. 285, 



pi. ii, figs. 1 a, b. 



— — Beuss, 1845. In Geiuitz's Grundriss, p. C65, pi. xxiv, 



fig. 41. 



— AMiiONEA, Leymerie, 1846. Mem. Soc. Geol. France, ser. 2, vol. i, 



p. 359, pi. xiii, figs. 11a, h. 



— complanata, Biltimeyer, 1850. Nouv. Mem. Soc. Helvet. Sci. Nat., 



vol. xi, Mem. 2, p. 108, pi. iv, fig. 56. 



— AHABiCA, Carter, 1852. Ann. Mag. Nat. Hist., ser. 2, vol. x, pp. 161 



—176, pi. iv, figs. 1—9. 



— — — 1853. Journ. Bombay Branch E. Asiatic Soc, 



vol. iv, p. 437, pi. xviii. 



— Haediei, d'ArcIiiac and Raime, 1854. Foss. Nummulit. Inde, livr. 2, 



p. 346, pi. XXXV, figs. 6, 

 6 a — c, granulosa. 



— COMPLANATA, £ro?in, 1853-6. Lethsea Geogn., edit. 3, vol. iii, p. 208, 



pi. xxxv^ figs. 7 a — d. 



— — T. Wrighf,lSb5. Ann. Mag. Nat. Hist., ser. 2, vol. xv, 



p. 75, pi. vii, figs. 4 a, h. 



— — Carpenter, 1859. Piiil. Trans., vol. cxlix, pp. 12—30, 



pi. iv ; pi. V, figs. 1 — 12 ; pi. vi, 

 figs. 1—4. 



— — Parker and Jones, 1860. Quart. Journ. Geol. Soc, 



vol. xvi, p. 302, No. 149, Tables. 



— ARABiCA, Carter, 1861. Ann. Mag. Nat. Hist., ser. 3, vol. viii, 



pp. 309—320, pi. xvii, figs. 10—14. 



— COMPLANATA, Parker and Jones, 1861. Ibid., ser. 3, vol. viii, p. 229. 



— — Miehelotti, 1861. Nat. Verb. Holl. Maatsch-wet., 



ser. 2, vol. xv, p. 20, pi. i, figs. 14, 15. 



— — Carpenter, 1862. Introd. Foram., p. 247, pi. xvii. 



