Foraminifera of the Gault of Folkestone. By F. Chapman. 1G3 
Marginulina striatocostata f Reuss (plate IV. fig. 21). 
Marginulina striatocostata Reuss, 1862, tom. cit. p. 62, plate vi. 
fig. 2. 
This species is recorded by Reuss from the Upper Hils formation 
near Brunswick. It is found at Folkestone in zone iii., very common ; 
zone iv., very common ; zone x., very rare ; zone xi., 40 ft. from the 
top, very rare ; 25 ft. very rare. 
Marginulina Munieri Berthelin (plate iv. fig. 22). 
Marginulina Munieri Berthelin, 1880, Mem. Soc. geol. France, 
ser. 3, vol. 1, No. 5, p. 33, plate 1, fig. 19 a, b. 
This species is not a common one in the Folkestone series. It 
was first described from the French Gault (Berthelin). At Folkestone 
it is found in zone v., very rare ; zone x., very rare ; zone xi., 50 ft., 
very rare ; 45 ft., frequent ; 40 ft., frequent. 
Marginulina robusta Reuss (plate IV. fig. 23). 
Marginulina robusta Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. 
Wien, vol. xlvi. p. 63, plate vi. figs. 5, 6. 
This species has thick and rounded costae, which is one of the 
characters that distinguish it from the foregoing. 
M. robusta is recorded from the Upper Hils clay, the Speeton 
clay, and the Tardefurcatus- clay of North Germany (Reuss). At 
Folkestone it is found in zone i., specimen a, very rare; zone i., 
specimen b, very rare ; zone ii., specimen c , very rare ; zone v., very 
rare ; zone x., rare ; zone xi., 55 ft. from the top, frequent. 
Marginulina Jonesi Reuss (plate IV. fig. 24). 
Marginulina Jonesi Reuss, 1862, tom. cit., p. 61, plate v. fig. 19. 
This species was originally described from the Upper Hils clay 
of Germany (Reuss). It is not uncommon in the Gault series. 
Possibly it is only an attenuated variety of species like M. Munieri. 
It is found at Folkestone in zone iii., frequent ; zone xi., 55 ft. from 
the top, frequent ; 50 ft., very rare ; 45 ft., frequent ; 40 ft., rare ; 
35 ft., rare ; 30 ft., frequent ; 25 ft., common ; 12 ft., very rare ; 
6 ft., very rare. 
