For aminif era of the Gault of Folkestone. By F. Chapman. 653 
C. Bononiensis was found in the Gault of Folkestone in zone ii., 
specimen c, very rare; zone iii., very common; zone iv., frequent; 
zone vi. } very rare ; zone ix., very rare ; zone x., rare ; zone xi., 55 ft. 
from the top, common ; 50 ft., rare ; 45 ft., frequent ; 40 ft., very 
rare ; 35 ft., common ; 30 ft., very rare ; 25 ft., frequent ; 20 ft., 
rare ; 12 ft., very rare. 
Cristellaria Italiea Defrance sp., plate X. fig. 10. a, h. 
Saracenaria Italiea Defrance, 1824, Diet. Sci. Nat., vol. xxxii, 
p. 177 ; vol. xlvii. p. 314. — Atlas Conch., plate xiii. fig. 6. Cristel- 
laria Italiea Parker, Jones and Brady, 1865, Ann. and Mag. Nat. 
Hist., ser. 3, vol. xvi. pp. 21, 32, plate i. figs. 41, 42. C. Italiea 
Brady, 1884, Ohall. Rep., vol. ix. p. 541, plate lxviii. figs. 17, 18, 
20-23. 
C. Italiea as it appears to be generally accepted consists of an 
elongate test, triangular in transverse section, and with a small and 
open spiral commencement ; the edges of the test are usually more 
or less rounded, hut the specimens from the Gault bear some affinity 
towards C. navicula in that the edges are sharp, and the back distinctly 
keeled, but are separated from that form on account of the elongation 
of the test. As a recent form C. Italiea is found in moderately 
shallow water, at depths from about 100 to 700 fathoms. It has 
been noted in the fossil condition from beds of Neocomian age at 
Littleton, in Surrey (author’s MS.). It has also been recorded from 
the Chalk of the North of Ireland (Wright) and from various strata 
of Tertiary age. 
C. Italiea was found in the Folkestone Gault in zone i., specimen 5, 
rare ; zone ii., specimen a , very rare ; zone iv., very rare ; zone ix., 
very rare ; zone x., very rare ; zone xi., 20 ft. from the top, very rare : 
12 ft., very rare. 
Cristellaria vestita Berthelin, plate X. fig. 11 a, h. 
Cristellaria vestita Berthelin, 1880, Mem. Soc. geol. France, 
ser. 3, vol. i. No. 5, p. 55, plate iii. fig. 22 a , h. 
This pretty form is a fairly constant one in the Gault series 
from Folkestone. It was described by Berthelin from the Gault of 
Montcley, France, and it has also been found in strata of Neocomian 
age, viz. the Bargate-beds at Littleton in Surrey (author’s MS.). 
C. vestita was found at Folkestone in zone iii., very rare; zone v., 
very rare ; zone vii., very rare ; zone x., very rare ; zone xi., 55 ft. 
from the top, frequent ; 50 ft., frequent ; 40 ft., frequent ; 35 ft., 
rare ; 30 ft., rare ; 12 ft., very rare. 
Cristellaria complanata, Reuss, plate X. fig. 12 a,h. 
Cristellaria complanata Reuss, 1845, Yerstein. bohm. Kreidef., 
pt. i. p. 33, plate xiii. fig. 54. C. complanata Reuss, 1862, Sitzungsb. 
d. k. Ak. Wiss. Wien, vol. xlvi. p. 92, plate xii. fig. 13 a, b. 
