Foraminifera of the Gault of Folkestone. By F. Chapman. 583 
very common ; zone vi., rare ; zone vii., very common ; zone xi., 50 ft. 
from the top, frequent ; 45 ft., very rare ; 40 ft., very rare ; 35 ft., 
rare ; 30 ft., very rare; 25 ft., rare ; 12 ft., rare. 
Lagena sulcata Walker and Jacob, plate VIII. fig. 11. 
Serpula ( Lagena ) sulcata Walker and Jacob, 1798, Adams’s 
Essays, Kanmacher’s ed., p. 634, plate xiv. fig. 5. Lagena sulcata 
Parker and Jones, 1865, Phil. Trans., vol. civ. p. 351, plate xiii. 
figs. 24. 28-32, and plate xvi. figs. 6, 7. L. sulcata Brady, 1884, 
Chalk Bep., vol. ix. p. 462, plate lvii. figs. 23, 26, 33, 34. 
This well-marked species is here recorded for the first time from 
the Gault. It also occurs fossil in shales of Upper Silurian age; in 
the Lias of Yorkshire (Blake) ; in the Maestricht Chalk (Parker and 
Jones) ; and in various Tertiary beds ranging up to the present time. 
In recent deposits it is found in all latitudes, and in shallow- water to 
depths as great as 2750 fathoms. In the Gault it is found in zone 
ii., specimen c, very rare ; zone iv., very rare. 
Lagena acuticosta Beuss, plate VIII. fig. 12 a, h. 
Lagena acuticosta Beuss, 1861, Sitzungsb. d. k. Ak. Wiss. Wien, 
vol. xliv. p. 305, plate i. fig. 4. L. acuticosta Beuss, 1862, Sitzungsb. 
d. k. Ak. Wiss. Wien, vol. xlvi. p. 331, pi. v. fig. 63. 
The solitary specimen found in the Gault agrees with the form 
described by Beuss, with the exception that the Gault specimen has 
thinner costse. It is very closely allied to L. sulcata. Previously 
recorded from the Maestricht Chalk (Beuss) ; and the Septaria-clay of 
Pietzpuhl (Schlicht). Found in the Gault in zone v., very rare. 
Lagena gracilis Williamson, plate VIII. fig. 13. 
Lagena gracilis Williamson, 1818, Ann. and Mag. Nat. Hist., 
ser. 2, vol. i. p. 13, pi. i. figs. 3, 4. L. gracilis Brady, 1884, Chalk 
Bep., vol. ix. p. 464, plate lviii. figs. 2, 3, 7-10, 19, 22-24. 
This elegant and somewhat variable form is found in the Gault 
series for the first time. Its variation consists in the relative length 
of the neck, and in the degree of development and thinness of the 
costse. In one example, at least, the test possesses the typical mucro- 
nate or apiculate aboral end ; whilst the others have that end den- 
ticulate. This species has also been found in the Chalk of Biigen 
(Marsson) ; in the Septaria-clay of Pitzpuhl (Beuss and Schlicht) ; 
and in various Pliocene and Post-pliocene beds. As a recent form 
it is well distributed and is found to as great a depth as 2775 fathoms. 
In the Gault it occurs in zone ii., specimen a , very rare ; zone iii., 
very rare ; zone xi., 20 ft. from the top, very rare. 
