156 
Transactions of the Society. 
Dover and Charing, and the Gault of Kent (Rupert Jones). This 
species is found in zone x., frequent. 
Frondicularia pinnseformis (plate III. figs. 9, 10, 11). 
[In the Gault series of Frondiculariee numerous examples occur of 
a two-ribbed species, which is perhaps somewhat closely allied to 
F. inversa and F. hastata Rom. It seems necessary, however, to treat 
our species as distinct, since it is always characterized by the two 
superficial ribs, and the form also occupies a prominent place among 
the Gault Foraminifera. Prof. T. Rupert Jones has already made 
MS. notes of this form, which he noticed many years ago, and he has 
with great generosity allowed me to make full use of his MS.] 
Shell elongate, acutely oval, more strongly compressed at the ends 
than at the centre ; tapering to an obtuse point at the distal end ; the 
ahoral end acuminate. Chambers numbering from five to sixteen, 
finely striate or smooth, slightly convex, forming acute angles, the 
limbs of the last three or four extending to within one- half of the 
entire length of the shell. The edge of the shell in the earlier half 
rounded, afterwards more or less square. Two sharply-edged longi- 
tudinal ridges occupy the central surface, wider apart at the distal than 
at the aboral end. Length 1/40-1/10 inch. 
One of the specimens here figured has the primordial chamber 
singularly like that of Nodosaria bactroides. A species of Frondi- 
cularia has been recorded from the Phosphate beds of Cambridge* by 
G. R. Vine as u Frondicularia var. with two parallel longitudinal ribs,” 
which is evidently the same as F. pinnseformis . This species is found 
in the Gault of Folkestone in zone ix., rare ; zone x., very common ; 
zone xi., 55 ft., from the top, common ; 45 ft., common ; 40 ft., rare ; 
35 ft., very rare ; 30 ft., frequent ; 25 ft., rare. 
Frondicularia Karreri Berthelin sp. (plate III. fig. 12). 
Flabellina Karreri Berthelin, 1880, Mem. Soc. geol. France, 
ser. 3, vol. i. No. 5, p. 62, plate iv. figs. 1-3. 
This species is here placed in the genus Frondicularia since the 
irregular development of the commencing series of chambers is by no 
means Cristellarian ; that is, the unequal increase in size of one or 
other side of the shell produces no marked tendency to a curved axis 
of growth. This species evidently bears some affinity towards 
F. pinnseformis, but in F. Karreri the longitudinal or radial ribs 
are not so prominent and are more numerous and irregular. It has 
previously been recorded from the French Gault. It is found at 
Folkestone in zone v., frequent ; zone vii., common ; zone viii., very 
rare ; zone x., very rare ; zone xi., 55 ft., from the top, rare ; 45 ft., 
very rare. 
* Proc. Yorks. Geol. and Polyt. Soc., xi. p. 273. 
