Foraminifera of the Gault of Folkestone. By F. Chapman. 1G1 
Sitzungsb. d. k. Ak. Wiss. Wien, vol. xlvi. p. 59, plate v. fig. 13 ; 
plate vi. fig. 8. 
This form, which is more attenuate and irregular than M. glabra , 
was found by Reuss in the Minimus-clay of the Rhine, &c. ; also 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 iii., rare ; zone iv., very rare ; zone v., very rare ; zone x., 
rare ; zone xi., 40 ft. from the top, rare ; 30 ft., very rare ; 12 ft. rare. 
Marginulina hamulus (plate IV. fig. 13 a, b). 
Shell consisting of about seven chambers, the first five of which 
are very low in proportion to their breadth, the latter ones being 
about half as high as broad, and well-inflated. The general contour 
of the shell bears some resemblance to that of M. insegualis , but it 
has the aboral pointed end bent into a sharper or hook-shaped curve. 
Length 1 /48 in. 
This form is found in the Folkestone Gault in zone i., specimen b , 
very rare; zone xi., 12 ft. from the top, very rare. 
Marginulina linearis Reuss (plate IV. fig. 14). 
Marginulina linearis Reuss, 1862, Sitzungsber. d. k. Ak. Wiss. 
Wien, vol. xvi. p. 60, plate v. fig. 15. 
This species has been recorded by Reuss from the Minimus- clay of 
North Germany; and also from the French Gault (Berthelin). It 
is found at Folkestone in zone iii., frequent ; zone xi., 30 ft. from the 
top very rare; 12 ft., very rare. 
Marginulina debilis Berthelin (plate IV. fig. 15). 
Marginulina debilis Berthelin, 1880, Mem. Soc. geol. France, 
ser. 3, vol. i. No. 5, p. 35, plate iii. fig. 28. 
This very elegant species is a characteristic one in the Gault. It 
may possibly be a depauperated variety of Nodosaria legumen Reuss, 
with more marginally disposed apertures than is usually found in 
that species. This form is described by Berthelin from the Gault of 
France. At Folkestone it is found in zone iii., common; zone iv., 
very rare ; zone v., common ; zone vi., very rare ; zone vii., very rare ; 
zone x., very rare ; zone xi., 55 ft. from the top, very rare ; 50 ft., 
common ; 45 ft., common ; 35 ft., rare ; 30 ft., very rare ; 25 ft., rare. 
Marginulina Folkestoniensis (plate IV. figs. 16 and 17). 
The shell consists of from 3-7 chambers or more in the example 
found, arranged in a slightly curved line, well-inflated, and with the 
sutures deeply marked ; the initial chamber is globose, and with a 
sharp spike. The surface of the shell is decorated with a few fine 
longitudinal costae, generally more strongly developed towards the 
proximal portion of each segment, and sometimes bridging the sutural 
line. Length 1/55 to 1/24 inch. 
