Foraminifera of the Gault of Folkestone. By F. Chapman. 
9 
Sub-family P OL YMORPHININM. 
Polymorphina d’Orbigny [1826]. 
Polymorphina lactea Walker and Jacob sp., plate II. fig. 3. 
Serpula lactea Walker and Jacob, 1798 (fide Kanmacher). 
Adams’ Essays, 2nd ed., p. 634, plate xxiv. fig. 4. Globulina lacrima 
Beuss, 1845, Yerstein. bohrn. Kreidef., part i. pp. 40, 110, plate xii. 
fig. 6 a-c ; plate xiii. fig. 83 a, b. Polymorphina lactea Brady, 
1884, Chall. Bep., vol. ix. p. 559, plate lxxi. fig. 11. Burrows, 
Sherborn, and Bailey, 1890, p. 561. Journ. Boy. Micr. Soc., p. 561, 
plate xi. fig. 9. P. amygdaloides Iidem, ibid., plate xi. fig. 12. 
Fistulose Form, plate II. fig. 4. 
Misilus aquatifer Montfort, 1808, Conch. Syst., vol. i. p. 294, 
74 e genre. Polymorphina horrida Wright, 1875, Bep. and Proc. 
Belf. Nat. Field Club, vol. for 1873-4, Appendix, p. 85, plate iii. 
fig. 14. P. prselonga Terquem, 1878, Mem. Soc. geol. France, ser. 3, 
vol. i. No. 3, p. 39, plate iii. fig. 21. P. amygdaloides Idem, ibid., 
p. 39, plate iii. fig. 28. P. solidula Idem, ibid., p. 40, plate iii. fig. 33. 
The Gault form of P. lactea is rather shorter and stouter than 
the better known and more typical specimens which are met with in 
later Tertiary and recent deposits. It is distinguished typically by 
its ovate or subpyriform, inflated test. The Gault variety is not far 
removed from P. gibba , from which it differs only in being slightly 
longer and more compressed. 
P. lactea has been recorded from Jurassic beds of the south 
of England (Parker and Jones) ; from the Gault of Montcley (as 
P. lacryma (Berthelin) ; from the Bed Chalk of Speeton (Burrows, 
Sherborn, and Bailey) ; from the Cretaceous of Bohemia and Bussia ; 
and from many important fossiliferous strata of Tertiary age. 
As a recent form P. lactea affects shallow to moderately-shallow 
waters. 
The fistulose examples of this species from the Gault have the 
outgrowths confined to the apical region of the test. 
The ordinary form of this species was found in the Gault of 
Folkestone in zone xi., 45 ft. from the top, very rare ; 35 ft. from 
the top, very rare. 
The fistulose modification was found in zone xi., 12 ft. from the 
top, very rare ; 6 ft., very rare. 
Polymorphina gibba d’Orbigny, plate II. fig. 5. 
Polymorphina ( Globulina ) gibba d’Orbigny, 1826, Ann. Sci. Nat., 
vol. vii. p. 266, No. 20 ; Modele No. 63. Globulina gibba d’Orbigny 
1846, Foram. Foss. Yienne, p. 227, plate xiii. figs. 13, 14. Poly- 
morphina gibba Jones, Parker, and Brady, 1866, Monogr. Crag 
