Foraminifera of the Gault of Folkestone . By F. Chapman. 595 
N. prismatica Burrows, Sherborn and Bailey, 1890, Journ. Roy. 
Micr. Soc., p. 557, plate ix. fig. 25 a, h. 
This fossil has been recorded from various beds in the Gault and 
the Speeton Clay of North Germany (Reuss) ; from the French Gault 
(Berthelin) ; and from the Red Chalk of Speeton (Burrows, Sherborn 
and Bailey). In the Folkestone Gault it is found in zone i., speci- 
men b, rare ; zone ii., specimen b, rare ; zone ii., specimen c, very 
rare ; zone iii., common ; zone iv., rare ; zone v., common ; zone vi., 
very rare ; zone vii., very rare ; zone x., frequent ; zone xi., 55 ft. 
from the top, frequent ; 45 ft., rare ; 35 ft., very rare ; 20 ft., very 
rare ; 12 ft., frequent ; 6 ft., very rare. 
Nodosaria orthopleura Reuss, plate IX. figs. 22, 23. 
Nodosaria orthopleura Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. 
Wien, vol. xlvi. p. 89, plate xii. fig. 5. 
This is a very typical species from the Gault. It was originally 
described by Reuss from Folkestone, and appears to be restricted to 
that locality. It can be easily distinguished from N. prismatica by 
its thinner costae, and perfectly straight edges. The number of the 
costae is generally five, but sometimes six. It occurs in zone ii., 
specimen b, very rare ; zone iii., very rare ; zone iv., very rare ; 
zone v., common ; zone vi., very rare ; zone vii., frequent ; zone viii., 
common ; zone ix., frequent ; zone x., very common ; zone xi., 55 ft. 
from the top, frequent ; 50 ft., common ; 45 ft., frequent ; 40 ft., 
frequent ; 35 ft., common ; 30 ft., common ; 25 ft., common ; 20 ft., 
frequent ; 12 ft., rare ; 6 ft., common. 
Nodosaria tetragona Reuss, plate IX. fig. 24. 
Nodosaria tetragona Reuss, 1860, Sitzungsb. d. k. Ak. Wiss. 
Wien, vol. xl. p. 181, plate ii. fig. 1. 
The specimen originally described was obtained by Reuss from the 
greensand in the Gault of the Rhine. It is perhaps only a four- 
ribbed variety of the more constant form N. orthopleura , as examples 
are sometimes seen having a tendency to become five-ribbed like the 
latter species. It occurs in zone iv., very rare ; zone vii., very rare ; 
zone x., rare ; zone xi., 35 feet from the top, very rare ; 12 ft., very 
rare ; 6 ft., rare. 
Frratum . — In Part III. of this paper, 1892, p. 750, line 12 from 
the bottom, for annectens read complanata. 
1893. 
2 T 
