326 
Transactions of the Society. 
The Gault specimens belong to the above species rather than to 
T. papillata, since they are of small size and have very few papillae. 
Zone x., very rare ; zone xi., 35 ft. from the top, very rare. 
Hokmosina Brady, 1879. 
Hormosina ylobulifera Brady, plate VI. figs. 10 a and b. 
Hormosina ylobulifera Brady, 1879, Quart. Journ. Micr. Sci., vol. 
xix. n.s. p. 60, plate iv. figs. 4, 5. H. ylobulifera Brady, 1884, 
Chall. Kep., vol. ix. p. 326, plate xxxix. figs. 1-6. 
Dr. Brady records this as a recent deep-water form. One very 
perfect specimen from the Gault, zone i., specimen a. 
Ammodiscus Beuss, 1861. 
Ammodiscus incertus d’Orbigny sp., plate VI. fig. 11. 
Opereulina incerta d’Orbigny, 1839, Foram. Cuba, p. 71, plate vi. 
figs. 16, 17. Ammodiscus incertus Brady, 1884, Chall. Kep., vol. ix. 
p. 330, plate xxxviii. figs. 1-3. 
This form, which makes its first appearance in beds of Carboniferous 
age, has been recorded from the Ked Chalk of Speeton, by Messrs. 
Burrows, Sherborn, and Bailey.* 
In the Gault specimens the test is composed of very fine arena- 
ceous material, and is usually of an orange-brown colour. A few 
specimens were found in which the shell is elliptical, thus closely 
resembling the specimen from the Ked Chalk. Zone ii., specimen c, 
frequent; zone iv., rare; zone xi., 50 ft. from the top, very rare; 
45 ft., very rare ; 40 ft., common ; 35 ft., rare ; 30 ft., frequent ; 
25 ft., very rare. 
Ammodiscus tenuis Brady, plate VI. fig. 12. 
Ammodiscus tenuis Brady, 1881, Quart. Journ. Micr. Sci., vol. 
xxi. n.s. p. 51. A. tenuis, Brady, 1884, Chall. Kep., vol. ix. p. 332, 
plate xxxviii. figs. 4-6. 
This form occurs in the Gault generally associated with A. incertus , 
and may be considered as a thin variety of that type. The figured 
specimen has the peripheral edge of the shell sharp, instead of 
rounded as in the recent forms figured by Brady ; some of the Gault 
specimens, however, are in all respects similar. The specimen figured 
by Messrs. Burrows, Sherborn, and Bailey strikingly resembles the 
Gault forms. It occurs in zone iv., very rare ; zone xi., 40 ft. from 
the top, rare ; 35 ft., very rare; 30 ft., rare; 6 ft., very rare. 
* This Journal, 1890, p. 552, plate VIII. fig. 8. 
