568 
THE VOYAGE OF H.M.S. CHALLENGER. 
Polymorpliina thouini is a rare form, and in the recent condition has only been 
observed in the Levant, 90 fathoms, and off East Moncoeur Island, Bass Strait, 38 
fathoms. 
As a fossil it occurs in the Eocene of the Paris Basin, in the Pliocene clays of 
Northern Italy, and in the Crag of Suffolk. 
Polymorphina problema, d’Orbigny (PI. LXXII. fig. 20 ; PI. LXXIII. fig. l). 
Polymorphina ( Guttulina) problema, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 266, No. 14. 
— Module, No. 61. 
„ „ crassatina, Munster, 1838 (fide Roemer), Neues Jahrb. fiir Min., &c., 
p. 385, pi. iii. fig. 30. 
„ ,. spicceformis, Roemer, 1838 Ibid, p. 386, pL iii. fig. 31. 
Guttulina problema, d’Orbigny, 1846, For. Foss. Vien., p. 224, pi. xii. figs. 26-28. 
„ austriaca, Id. Ibid. p. 223, pi. xii. figs. 23-25. 
Polymorphina uvula , Ebrenberg, 1854, Mikrogeologie, pi. xxvi. fig. 28. 
„ „ Egger, 1857, Neues Jabrb. fiir Min., &c., p. 285, pi. x. figs. 26-29. 
Guttulina rotundata, Reuss, 1864, Sitzungsb. d. k. Akad. Wiss. Wien, vol. 1. p. 469, pi. iii. fig. 4. 
„ pusilla, Stache, 1865, Novara-Exped., geol. Theil, vol. i. pt. 2, p. 265, pi. xxiv. 
fig. 12. 
Polymorpliina problema , Brady, Parker, and Jones, 1870, Trans. Linn. Soc. Loud., vol. xxvii. 
p. 225, pi. xxxix. fig. 11, a. b. 
\ 
Polymorpliina communis, d’Orbigny (PI. LXXII. fig. 19). 
Polymorphina (Guttulina) communis, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 266, pi. xii. 
figs. 1-4. — Modele, No. 62. 
Guttulina vitrea, Id., 1839, Foram. Cuba, p. 128, pi. ii. figs. 1-3. 
„ communis, Id., 1846, For. Foss. Vien., p. 224, pi. xiii. figs. 6-8. 
Globulina irregularis. Id. Ibid. p. 226, pi. xiii. figs. 9, 10. 
Guttulina cretacea, Alth, 1849, Haidinger’s Natunv. Abbandl., vol. iii. p. 262, pi. xiii. fig. 14. 
„ semiplana, Reuss, 1851, Zeitschr. d. deutsch. geol. Gesellsch., vol. iii. p. 82, pi. vi. 
fig. 48. 
Polymorpliina (Guttulina) communis, Egger, 1857, Neues Jabrb. fiir Min., &c., p. 288, pi. xiii. 
figs. 16-18. 
„ „ lata, Id. Ibid. p. 288, pi. xiii. figs. 22-24. 
Guttidina fissurata, Stacbe, 1865, Novara-Exped., geol. Tbeil, voL i. part 2, p. 263, pi. xxiv. 
fig. 10. 
„ obliquata, Id. Ibid. p. 264, pi. xxiv. fig. 11. 
Polymorphina semiplana, Reuss, 1870, Sitzungsb. d. k. Akad. Wiss. Wien, vol. lxii. p, 488, 
No. 16. — Schlicht, 1870, Foram. Pietzpubl, pi. xxvii. figs. 22-33, &e. 
„ problema, var. communis, Id. Ibid., p. 487, No. 15. — Schlicht, 
pi. xxx. figs. 13-16. 
„ communis, Brady, Parker, and Jones, 1870, Trans. Linn, Soc. Lond., vol. xxvii. 
p. 224, pi. xxxix. fig. 10, a.b. 
D’Orbigny’s Models, Nos. 61 and 62, portray what appear at first sight two tolerably 
well-marked varietal forms. The former, that of Polymorphina problema, presents about 
