Foraminifera of the Gault of Folkestone. By F. Chapman. 651 
from the Minimus-thon of Eilum in North Germany, and is also 
recorded by the same author from the Gault of Folkestone. C. sul- 
cifera has also been found in the Neocomian beds of Littleton in 
Surrey (author’s MS.) 
Found at Folkestone in zone i., specimen b, frequent ; zone iii., 
very rare ; zone ix., rare ; zone xi., 45 ft. from the top, very rare ; 
40 ft., very rare. 
Cristellaria triangularis d’Orbigny, plate X. fig. 3 a , b. 
Cristellaria triangularis d’Orbigny, 1840, Mem. Soc. geol. 
France, ser. i. vol. iv. p. 27, plate ii. figs. 21, 22. C. triangularis 
Reuss, 1845, Verstein. bolim. Kreidef., pt. i. p. 34, pi. viii. fig. 48. 
This is also a distinctly Cretaceous form and has been recorded 
from the Gault of Folkestone (Rupert Jones in Morris’s Cat. of Br. 
Foss., and also by Reuss) ; the Gault of Montcley (Bertlielin) ; the 
“ Chalk Detritus ” of Charing, Kent (Rupert Jones) ; the Planer- 
mergel of Bohemia (Reuss) ; the White Chalk of Kent (Rupert 
Jones) ; the Chalk of Sens (d’Orbigny) ; the Phosphatic Chalk of 
Taplow (Chapman) ; and from the Upper Chalk of the North of 
Ireland (Wright). 
Found in the Gault of Folkestone in zone iv., very rare ; zone v., 
very rare ; zone viii., very rare ; zone xi., 35 feet from the top, very 
rare ; 6 ft., very rare. 
Cristellaria trunculata Berthelin, plate X. fig. 4 a , b. 
Cristellaria trunculata (pars), Berthelin, 1880, Mem. Soc. geol. 
France, ser. 3, vol. i., No. 5, p. 53, plate iii. fig. 27 a , b. 
This species was described by Berthelin from the Gault of Mont- 
cley. It is closely allied to C. oligostegia Reuss. It differs from the 
latter form in the diminutive rolled commencement and greater com- 
pression and elongation of the test. The segments are usually much 
more numerous in C. trunculata ; but both forms have the deeply in- 
dented sutures between the chambers, and the produced terminal 
orifice. 
C. trunculata was found in the Gault of Folkestone in zone v., 
very rare ; zone xi., 30 ft. from the top, very rare ; 6 ft., very rare. 
Cristellaria oligostegia Reuss, plate X. fig. 5 a, b. 
Cristellaria oligostegia Reuss, 1860, Sitzungsb. d. k. Ak. Wiss. 
Wien, vol. xl. p. 213, plate viii. fig. 8. C. oligostegia Reuss, 1862, 
Sitzungsb. d. k. Ak. Wiss. Wien, vol. xlvi. p. 93, plate xiii. fig. 2. 
Among the Gault Cristellaria which have few chambers and a 
well-rounded contour some individuals may be noticed which come 
within the description of Reuss’ C. oligostegia , which was first found 
by that author in the detrital deposits of Westphalia, and subsequently 
in the Gault of Folkestone. It has since been found in the Neo- 
comian beds of Chilworth, in Surrey (author’s MS.) 
