286 
'THE CRETACEOUS ROCKS OF BRITAIN. 
Family. 
Genera. 
No. of 
Species. 
— 
Miliolidae 
Nubecularia 
. 
2 
Both new species. 
Spiroloculina - 
- 
2 
Miliolina- 
- 
2 
One new species. 
Astrorhizidse 
Rhizammina - 
- 
2 
One ,, „ 
Lituolkke - 
Reophax 
- 
5 
One ,, „ 
Haplophragmium 
- 
8 
One „ „ 
Ammodiscus - 
- 
4 
One „ „ 
Trochammina- 
- 
2 
One „ „ 
Textulariidae 
Textularia 
- 
10 
One distorted. 
Verneuilina - 
- 
1 
Tritaxia - 
- 
2 
Spiroplecta 
■- 
2 
Gaudryina 
- 
6 
One new species. 
Bulimina 
- 
12 
Bolivina - 
- 
1 
Pleurostomella 
- 
2 
One new species. 
Lagenidae - 
Lagena - 
-■ 
2 
N odosaria 
-- 
12 
Frondicularia 
. 
3 
Flabellina 
- 
1 
Rhabdogonium 
- 
3 
Marginulina - 
- 
5 
Vagin ulina - 
- 
4 
Cristellaria 
- 
8 
One new species. 
'll 
Polymorphina 
- 
5 
Ramulina 
- 
2 
Globigerinidee 
Globigerina - 
- 
2 
! 
Rotaliidae - 
Discorbina 
- 
1 
|l 
Anomalina 
- 
2 
* 
Truncatulina- 
- 
1 
Rotalia - 
— 
2 
Of the 11G species which have been obtained eighty-eight are 
recorded by Mr. Chapman as occurring in the Gault, sixteen do 
not occur in that deposit, and twelve are new. The greatest number 
of species came from the soft marls of Folkestone and the Midland 
counties (Bedfordshire and Cambridgeshire), for little was done 
by washing the specimens of the indurated rocks of Dorset, the 
Isle of Wight, Norfolk, Lincolnshire, and Yorkshire, so that our 
knowledge of the Foraminifera of these districts is confined to 
the acid residues. These, however, gave some remarkable results, 
for it was clearly shown that from North-west Norfolk to Speeton 
the arenaceous Foraminifera were of different character to those 
contained in this zone in the south. 
The characteristic forms of this zone in North-west Norfolk, 
Lincolnshire, and Yorkshire were Ammodiscus incertus, Ammo- 
discus charoides, and Ammodiscus gordialis, all common as a rule. 
With these were associated Rhizammina sp. Reophctx nodulosa , not 
