12 
Transactions of the Society. 
Family LITUOLIDJE. 
Sub-family L1TUOLINM. 
Haplophragmium Eeuss [I860]. 
Hap l ophragmium Terquemi Berthelin, plate II. iig. 5. 
Haplophragmium Terquemi Berthelin, 1880, Mem. Soc. Geol. 
France, ser. 3, vol. i. No. 5, p. 22, pi. ii. fig. 1. 
This curious little Foraminifer may be easily overlooked, as M. 
Berthelin remarks; for it appears like an aggregated mineral flake 
rather than an organism, until it is viewed in a medium by trans- 
mitted light, when its septate character is easily seen. 
By the above author this Foraminifer has been compared with 
Spiroplecta as regards the tendency of the chambers to become biserial 
in their arrangement after the spiral part is completed ; but it has a 
terminal orifice instead of one apically lateral. 
H. Terquemi is one of the more or less closely related varieties 
of the flattened or foliaceous type of Haplophragmium, such as 
H. foliaceum Brady, H. Fontinense Terquem, and H. neocomianum 
Chapman ; and such forms are usually to be found in shallow water 
deposits which have been laid down with an excess of argillaceous 
fine sandy material and a paucity of calcareous matter. In passing, 
it is worth noting that foliaceous forms are in great evidence in such 
beds as the close-textured fuller’s earth of Surrey, and the clays from 
Wedmore Hill in Somerset. 
The species now before us, H. Terquemi, was originally described 
from the Gault of France, from the Department of i’Aube, by 
Berthelin. 
In the Gault of Folkestone it occurs in zone i., spec, a, rare; 
zone i., spec, b, rare ; zone ii., spec, a , rare ; zone ii., spec, b, common ; 
zone ii., spec, c , very common; zone iii., common ; zoneiv., very com- 
mon ; zone v., rare ; zone vi., very rare ; zone vii., very rare ; zone 
viii., frequent ; zone ix., frequent ; zone x., rare ; zone xi., 55 ft. 
from the top, common ; 30 ft., rare ; 25 ft., frequent ; 20 ft., very 
common ; 12 ft., very common ; 6 ft., very common. 
Sub-family T ROC HA MM ININ2E. 
Ammodiscus Eeuss [1861]. 
Ammodiscus Millettianus sp. nov., plate II. figs. 6 a~c. 
Test finely arenaceous, discoidal and flattened; consisting of a 
coiled and irregularly constricted tube, making only one or two 
convolutions. Externally the suture lines are completely covered by 
the later growth, and are only visible at certain parts by slight linear 
depressions. When moistened the form of the interior of the test can 
be more easily seen, xlperture oblique and slit-like, situated on the 
