108 FORAMINIFERA OF THE CRAG. 



S. QviROLOCVhw A CANA\AcvhATA, d'Orbigny, 1846. Plate III, figs. 39, 40 5 Woodcuts, 



figs. 3 a, Sb. 

 Part I, 1866, page 16 ; and Appendix II, 

 Table, No. 16. 



Spieoloculina CTMiiiUM, d'Orb., 1839. Hist. Nat. Canaries, p. 140, pi. iii, 



figs. 5, 6. 



— CANALicuLATA, d'Orb., 1846. Foram. Foss. Vienne, p. 269, pi. xvi, 



figs. 10—12. 



— — Costa, 1856. Atti Accad. Poiitan., vol. vii, fasc. 2, 



p. 312, pi. xxiv, fig. 10. 



— — var., Costa, 1856. Ibid., fig. 9. 



— Jones, Parker, and Brady, 1866. Monogr. Foram. Crag, p. 16, 



pi. iii, figs. 39, 40. 



— DEPEEssA, Terqicem, 1878. Mem. Soc. Geol. France, ser. 3, vol. i, 



p. 54, pi. X, fig. 11. 



— CANALICULATA, Terquem, 1881. Plage Dunkerque, fasc. 3, p. 133, 



pi. xvii, fig. 12. 



— LiMBATA, var., Brady, 1884. Report ' Challenger,' p. 150, pi. x, 



figs. 1, 2. 



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



vol. xii, p. 214, pi. xl, figs. 14, 15. 



— CANALICULATA, Egger, 1893. Abhandl. k. Bayer. Akad. Wiss., 



cl. ii.vol. xviii, pp. 218, 224, pi. i, 

 figs. 40, 41. 



— iMPEESSA, Egger, 1893. Ibid., figs. 35, 36. 



— — cfr. BiCAEiNATA, d'Orb.,''- Schioager, 1883. Palaeonto- 



graphica, vol. xxx, p. 85, pi. xxiv, 

 fig. 4. 



— DEPEESSA, d'Orbigny 



— PEEPOEATA, d'Orbigny 



— Geateloupt, d'Orbigny 



— BICAEINATA, d'Orhigny 



For notes on these forms see p. 35. 



Characters. — Lateral surfaces of the chambers plane, with or without limbate 

 sutures ; the peripheral margin channelled ; centre usually somewhat concave. 



The gradational differences of the test, due to greater or less amount of 

 shell-growth along the edges of the chambers, give rise to some confusion in the 

 classification of the noticeable varieties. If the exogenous or extra shell-growth 

 predominates on the edges of the periphery, it makes a channel along the outer 

 margin. This feature characterises d'Orbigny's well-shaped Spiroloculina canali- 



' As defined by Terquem, ' Mem. Soc. Geol. Fr.,' s^er. 3, vol. ii, 1882, p. 155, pi. xxiv, fig. 5. 



