10 
Transactions of the Society. 
Foram., plate i. figs. 49-51. P. subsphserica Berthelin, 1880, Mem. 
Soc. geol. France, ser. 3, vol. i. No. 5, p. 58, plate iii. fig. 18 a , b. 
P. gibba Brady, 1884, Chall. Rep., vol. ix. p. 561, plate lxxi. fig. 12. 
Polymorpha [ Polymorphina\ ovata Perner, 1892, Foraminifery 
Ceskeho Cenomanu, p. 64, plate viii. figs. 14-16. 
Fistulose Form, plate IT. fig. 6. 
Globulina tvbulosa d’Orbigny, 1846, Foram. Foss. Vienne, p. 228, 
plate xiii. figs. 15, 16. Polymorphina tvbulosa Jones, Parker, and 
Brady, 1866, Monogr. Foram. Crag, plate i. figs. 70, 72, 73. P. gihba 
fistulose form, Brady, 1884, Chall. Rep., vol. ix. p. 562, plate lxxiii. 
fig. 16. Wright, 1886, Proc. Belf. Nat. Field Club, Appendix, 
1885-86, p. 324, plate xxvi. fig. 11. P. gihba Goes, 1894, Kongl. 
Svenska Vetenskaps-Ak. Handlingar, vol. xxv. No. 9, p. 55, plate ix. 
fig. 522. 
P. gihba in its typical form is more nearly spherical than 
P. lactea , and the segments are never prominent as in the latter 
species, although the sutural lines are sometimes rather deeply im- 
pressed, as in d’Orbigny’s figure of a specimen from the Vienna 
Tertiaries, and Berthelin’s P. subsphserica from the French Gault. 
The fistulose variety of P. gibba from the Gault series, of which a 
characteristic example is here figured, is apparently always of the 
same type, the outgrowth being confined to the apical region of the 
test. 
P. gibba has been recorded from strata as old as the Ivimeridgian, 
and it is further found in nearly all fossiliferous strata of later date. 
The ordinary form of this species was found in the Folkestone 
Gault in zone xi., 45 ft. from the top, rare ; 40 ft., very rare ; 25 ft., 
very rare ; 12 ft. rare ; 6 ft., common. 
The fistulose form was found in zone xi., 45 ft. from the top, 
frequent ; 6 ft., very rare. 
Polymorphina gutta d’Orbigny, plate II. fig. 7. 
Polymorphina (Pyrulina) gutta d’Orbigny, 1826, Ann. Sci. Nat., 
vol. vii. p. 267, No. 28, plate xii. figs. 5, 6 ; Modele No. 30. Pyru- 
lina obtusa Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. Wien, vol. xivi. 
p. 79, plate ix. fig. 9. Polymorphina gutta Jones, Parker, and 
Brady, 1866, Monogr. Crag Foram., plate i. figs. 46, 47. 
Fistulose Form, plate II. fig. 8. 
Globulina horricla Reuss, 1845, Verstein. bohrn. Kreidef., pt. ii. 
p. 110, plate xliii. fig. 14. Polymorphina Boemeri Reuss, 1870, 
8itzungsb. d. k. Ak. Wiss. Wien, vol. lxii. p. 35 ; Schlich, 1870, Foram. 
Pietzpuhl, plate xxxiv. figs. 4-12, 14. 
The specimens from the Gault series are very variable ; and 
gradational forms are found ranging from the typical P. gutta to 
