Foraminifera of the Gault of Folkestone. By F. Chapman. 325 
The specimens from the Gault placed under this name are not 
so distinct in habit of growth as those from other formations ; but 
after some deliberate study of their structure it seems that they 
must find a place here, as they possess a chambered structure, are 
roughly spiral, and have a coarsely arenaceous test. The specimen 
figured has included in its shell-wall a Eotaline Foraminifer. This 
species has been recorded fossil from beds of Jurassic and Cretaceous 
age, and it also occurs in recent deposits generally as a shallow water 
form. In the Gault it occurs in zone x., rare ; zone xi., 20 ft. from 
the top, frequent. 
Plaeopsilina vesicularis Brady, plate VI. fig. 5. 
Placopsilina vesicularis Brady, 1879, Quart. Journ. Micr. Sci., 
vol. xix. n.s. p. 51, plate v. fig. 2. 
Hitherto recorded only as a recent form. The Gault specimens 
occur in zone vii., rare. 
Haplostiche Reuss [1861]. 
Haplosticlie Sherhorniana, plate VI. figs. 6, 7, 8. 
Test nearly cylindrical or more rarely flask-shaped and unseg- 
mented. The exterior thickly studded with glauconite grains, and 
the material forming the test cemented by a fine white arenaceous 
substance. In section the glauconite grains are seen to be disposed 
throughout the cementing substance ; the sarcode spaces irregular or 
feebly labyrinthic. This latter structure can only be made out by 
decalcifying a thin section, as the shells have been entirely filled 
with carbonate of lime during fossilization ; the labyrinthic structure 
is represented in the section (plate VI. fig. 8) by the clear spaces. 
The test terminates in a tubular neck of fine white arenaceous 
material. In some examples the test commences with a tolerably 
large fragment of extraneous material, thus giving it the appearance 
of an adherent form, as in fig. 7. The length varies from 1 /24 to 
1/12 in. I have much pleasure in naming this species after my 
friend Mr. C. D. Sherborn. This interesting Foraminifer is found in 
one horizon only, the “ greensand seam ” of zone xi., 20 ft. from the 
top, where it is very common. 
Sub-family TR0CHAMMININ2E. 
Thubahmina Brady [1879]. 
Thurammina albicans Brady, plate VI. fig. 9. 
Thurammina albicans, Brady, 1879, Quart. Journ. Micr. Sci., 
vol. ix. n.s. p. 46. T. albicans Brady, 1884, Chall. Rep., vol. ix. p. 323, 
plate xxxvii. figs. 2-7. 
