Foraminifera of the Gault of Folkestone. By F. Chapman. 6*41) 
Cristellaria Schloenbachi Beuss, plate IX. fig. 9 a , h. 
C. Schloenbachi Beuss, 1862, Sitzungsb. d. k. Ak. Wiss. Wien, 
vol. xlvi. p. 65, plate vi. figs. 14, 15. C. Schloenbachi Brady, 1884, 
Chall. Bop., vol. ix. p. 539, plate lxvii. fig. 7. 
Beuss describes this species from the Upper Ililsthon and the 
“ Speeton clay ” of North Germany, and it has also occurred in beds 
of Neocomian age at Littleton in Surrey (author’s MS.). Dr. Brady 
has figured C. Schloenbachi as a recent form, and records it from 
deep-sea deposits of intertropical areas from depths of 155 to 435 
fathoms. 
Found at Folkestone in zone i., specimen b , rare ; zone x., very 
rare: zone xi., 55 ft. from the top, very rare; 25 ft., very rare; 
12 ft., very rare. 
Cristellaria costulata sp. nov., plate IX. fig. 10. 
Test elongate, commencing -with a compressed" incipient spiral ; 
the chambers increase rapidly in size and become turgid. The 
surface of the test is relieved with more or less strong costulse, some- 
what interrupted, and sometimes oblique. Aperture marginal and 
produced. The general outline of the test resembles that of 
C. Schloenbachi Beuss. Length of figured specimen, 1/42 in. 
It is just possible that this form may be a Oristellarian modifica- 
tion of a species like Marginulina Jonesi , or another of the allied 
costate forms. 
The original type specimen was unfortunately lost after the draw- 
ing was made. 
C. costulata was found in zone v., very rare ; zone ix., very rare. 
Cristellaria gladius Philippi sp., plate IX. fig. 11, a, b. 
Mar gimdina, gladius Philippi, 1843, Beitr. z. Kenntniss d. Ter- 
tiarf. nordwest. Deutschk, p. 40, plate i. fig. 37, Cristellaria gladius 
Hantken, 1875, Mitth. a. d. Jahrb. k. ungar. geol. Anstalt, p. 51, 
plate v. fig. 12. 
Amongst the compressed arcuate forms of Cristellaria from the 
Gault there is one specimen which does not exactly correspond with 
any of the typical Cretaceous forms, but seems to be referable to the 
almost exclusively Tertiary species C. gladius. The Gault specimen 
also shows a decided thickening of the sutural lines, a character 
which is to be seen in typical examples of the species, but in this 
point it also bears some affinity to C. humilis. 
C. gladius was found in zone v., very rare. 
Cristellaria Bronni Bonier sp., plate IX. fig. 12 a, b , fig. 13 a, b. 
Planularia Bronni Bomer, 1841, Verstein. d. nordd. Kreidegeb., 
p. 97, plate xv. fig. 14. Cristellaria Bronni Beuss, 1862, Sitzungsb. 
d. k. Ak. Wiss. Wien, vol. xlvi. p. 70, plate vii. fig. 13 a, b. 
