CASSIDULINA LAEVIGATA. 171 



Globigertna, d'Orbigny. 



Burseoj.ina, Segnensa. 



Strophoconus and Megatiiyra, Ehrenberg. 



General Characters. — Test lenticular, oblong or ovate, biserial, folded on its 

 long axis, and coiled more or less completely on itself; rarely dimorphous. 

 Chambers elongate, curved ; the two series alternating, and the principal part of 

 the exposed chambers turned towards opposite sides of the shell. Aperture a 

 curved slit extending to the middle of the septal plane. 



1. Cassidulina laevigata, d'Orbigny, 1826. Plate IV, figs. 15 a, b. 

 Part I, 1866, Appendix II, Table, No. 70. 



Cassidulina laevigata, d'Orbigny, 1826. Ann. Sci. Nat., vol. vii, p. 282, No. 1, 



pi. xv [vi by error in the text], figs. 

 4 and 5 ; Modele, No. 41. 



— pttlciiella, d'Orbigny, 1839. Foram. Araer. Merid., p. 57, pi. viii, 



figs. 1—3. 



— laevigata, Ouvier, 1846 ? Eegne Anirn. (1836-46), vol. ix, p. 33, pi. xv, 



fig. 3. 



— — Beuss, 1846. In Geinitz's Grundr. Verstein., p. 660, 



pi. xxiv, fig. 42. 



— punctata, Beuss, 1S49. Denkscb. k. Akad. Wiss. Wien, vol. i, p. 376, 



pi. xlviii, figs. 4 a, b. 



— l^vigata, Parker and Jones, 1857. Ann. Mag. Nat. Hist., ser. 2, 



vol. xix ; p. 295, pi. xi, figs. 17 and 18. 



— — Williamson, 1858. Rec. Brit. Foram., p. 68, pi. vi, figs. 



141 and 142. 



— — Morris and Quekett, 1860. Catal. Hunterian Mus., 



p. 92, A. 34. 



— sicula, Seguenza, 1862. Atti Accad. Gioenia, ser. 2, vol. xviii, 



p. Ill, pi. i, figs. 7, la. 



— l^vigata, Sars, 1864. Foss. Dyrelevn. Qvarterper., pp. 62, 68, &c. 



— — Parker, Jones, and Brady, 1865. Ann. Mag. Nat. Hist., 



ser. 3, vol. xvi, p. 25, pi. ii, fig. 67. 



— — Parker and Jones, 1865. Phil. Trans., vol. civ, p. 377, 



pi. xv, figs. 1 — 4 ; pi. xvii, figs. 64 a — c. 



— — Brady, 1865. Nat. Hist. Trans. Northumb. and Durham, 



vol. i, p. 104, No. 1. 



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



Appendix II, Table, No. 76, pi. iv, 

 figs. 15 a, b. 



— — Hartwig, 1866. The Sea, 3rd edit., p. 381, fig. e. 



— Sars, 1868. Vidensk-Selsk. Forhaudl. for 1868, p. 249. 



— — G. M. Dawson, 1870. Canad. Nat., n. s., vol. v, p. 179. 



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