154 
Transactions of the Society. 
In the Folkestone-Gault collection it is represented by a single 
specimen only, from zone v. 
Lingulina semiornata Reuss (plate III. figs. 2 a, b, 3 a, b). 
Lingulina semiornata Reuss, 1862, tom. cit., p. 91, plate xii. 
fig. 11. 
This species -was first described by Reuss from the Gault of 
Folkestone in the paper above quoted, and it has been subsequently 
recorded from the Gault of France by Berthelin. I have also found 
one specimen in the Chalk-Marl of Eastwear Bay, Folkestone. The 
shell usually possesses seven chambers, as noted by Reuss, though one 
specimen in my collection has only four, and another, which is figured, 
has eight chambers. The two specimens figured are the varieties that 
can be easily recognized in the Gault series, and may represent 
differences referable to “ dimorphism.” This species is by no means 
a common one in the Gault, but is nevertheless fairly well dis- 
tributed through the formation. It is found in zone i., specimen b , 
very rare ; zone iii., very rare ; zone v., very rare ; zone vi., very rare ; 
zone x., very rare ; zone xi., 55 ft. from the top, very rare ; 50 ft., 
very rare ; 45 ft., frequent ; 40 ft., very rare ; 35 ft., rare ; 30 ft., 
rare ; 25 ft., frequent. 
Frondicularia Defrance [1824]. 
Frondicularia Loryi Berthelin (plate III. fig. 5 a , b). 
Frondicularia Loryi Berthelin, 1880, Mem. Soc. Geol. France, 
ser. 3, vol. i. No. 5, p. 60, plate iv. fig. 5. 
This species and the one next to be described may be regarded as 
links between the genera Lingulina and Frondicularia; but since 
their chambers are decidedly chevroned, they can more reasonably be 
assigned to the latter genus. F. Loryi has been recorded from the 
Fig. 
5 
6 . 
7. 
8 
9 
10 
11 
12 . 
13 
14. 
15. 
16. 
18. 
19. 
20 . 
21 . 
22. 
23. 
24. 
Plate IV. — continued. 
a , b. Frondicularia perovata sp. n. x 30. 
„ Cordai Reuss. x 45. 
— Flabellina didyma Berthelin sp. x 60. 
a, b. — Blidbdogonium tricarinatum Reuss, var. acutangulum 
Reuss var. x 60. 
a, b. ,, excavatum Reuss. x 60. 
a, b. 
a, b. — Margi 
a b. 
17. 
Maertensi Reuss. x 60. 
ulina glabra d’Orbigny. x 50. 
inxqualie Reuss. x 65. 
hamulus sp. n. x 60. 
linearis Reuss. x 60. 
debilis Berthelin. x 60. 
Folkestoniensis sp. n. x 60. 
aspera sp. n. x 60. 
tenuissima Reuss. x 60. 
sequivoca Reuss. x 60. 1 
striatocostata Reuss. x 60. 
Munieri Berth, x 60. 
robusta Reuss. x 50. 
Jonesi Reuss. x 60. 
