Transactions of the Society. 
054 
This species was described by Beuss from the Planermergel of 
Bohemia, and he subsequently recorded it from the Gault of Folkestone. 
It has also been found in beds of Neocomian age at Littleton in 
Surrey (author’s MS.). 
C. complanata was found at Folkestone in zone xi., 12 ft. from 
the top, frequent ; 6 ft., frequent. 
Cristellaria Bradyana sp. n., plate X. fig. 13 a , h. 
Test suboval, with nearly flat sides. It consists of about twelve 
narrow and gently arched chambers divided by sutural ridges which 
are interrupted towards the front of the shell, and nearer the dorsal 
edge become strongly swollen. The spiral commencement of the test is 
partially hidden by the overlapping of the last three chambers. There 
is a distinct umbilical excavation above the axis of the spiral. The 
dorsal edge of the last four chambers has a sinuous outline, and is 
deeply grooved. The aperture is terminal and the border marked with 
radiating lines. The front peripheral edge of the spiral portion of 
the test is rather sharply keeled. Length 1/45 in. ; greatest breadth 
1/80 in. 
At first sight the ornamentation of C. Bradyana reminds one of 
C. gemmata Brady.* The sutural ridges, however, in the former 
species are not broken up in such a manner as to give the distinctly 
beaded ornamentation seen in the latter form ; and, further, the 
peripheral aspect of C. Bradyana shows a keeled edge in the earlier 
part of the test, whereas in C. gemmata the peripheral edge is quite 
square. Although the two forms G. Bradyana and G. complanata 
are fairly distinct, yet they have some characters in common, and it is 
instructive to note that C. corn'planata is confined to the uppermost 
beds of the Gault, whilst G. Bradyana ranges through the middle 
and part of the upper portions. 
G. Bradyana was found in zone x., very common ; zone xi., 50 ft. 
from the top, rare ; 45 ft., rare ; 40 ft., very rare ; 35 ft., frequent ; 
25 ft., very rare. 
Cristellaria planiuscula Beuss, plate X. fig. 14 a, h. 
G. planiuscula Beuss, 1862, Sitzungsb. d. k. Ak. Wiss. Wien, 
vol. xlvi. p. 71, plate vii. fig. 5 1 a,b. C. planiuscula Berthelin, 1880, 
Mem. Soc. geol. France, ser. 3, vol. i. No. 5, p. 53, plate iii. fig. 25 a,h. 
This species was found by Beuss in the Neocomian beds of North 
Germany, and Berthelin describes it from the Gault of France. 
It was found at Folkestone in zone ii., specimen a, very rare; 
zone ii., specimen h, very rare ; zone iii., rare ; zone iv., very rare ; 
zone v., very rare ; zone xi., 55 ft. from the top, very rare ; 25 ft., 
very rare ; 20 ft., very rare ; 6 ft., very rare. 
* Chall. Rep., ix. p. 554, pi. lxxi. figs. 6, 7. 
