322 
The cretaceous iiocEs of britAiN. 
The number of species of Foraminifera obtained from the resi¬ 
dues by washing specimens of the Belemnite Marls from Dover 
and from the lower band from Hitchin, with others from the acid 
residues, is 34. The families and genera identified by Mr. F. 
Chapman are as follows : — 
Family. 
Genera. 
No. of 
species. 
— 
Miliolidse 
Not represented. 
Astrorhizidse 
Rhizammina - 
1 
Lituolidse 
Haplophragmium - 
2 
One new species. 
Ammodiscus - 
4 
Trochammina 
1 
Textulariidse - 
Textularia 
3 
Verneuilina - 
1 
Gaudryina 
2 
Bulimina 
4 
Pleurostomella 
1 
Lagenidse 
Nodosaria 
2 
Frondicularia- 
1 
A fragment. 
Flabellina 
1 
Vaginulina 
1 
Cristellaria 
3 
Polymorphina 
1 
Globigerinidse 
Globigerina - 
1 
Rotaliidse 
Truncatulina - 
2 
Anomalina 
3 
One new var. 
At this horizon Ammodiscus incertus, and A. charoides are now 
of common occurrence both at Dover and Hitchin, the same forms 
also occurring in a specimen from Betchworth, Surrey. With this 
exception the assemblage as a whole is similar to that in the zones 
below, and in all probability if more specimens from a more extended 
area had been examined the similarity would be still greater. 
The valves of the following Ostrac-ods were isolated from the 
Dover specimen of this zone and identified by Mr. Chapman : — 
Bairdia subdeltoidea ( Milnst. sp.) 
Paracypris siliqua (Jones). 
Bythocypris Brownei (Jones). 
Cythereis (sp.). 
Valves of Ostracoda also occurred in a washing of the lower 
marl-band at Hitchin and m the marl of Betch worth. 
Examination of the Residues. 
Detrital Minerals. The minerals which have at present been 
recognised in this zone are Quartz, Zircon, Tourmaline, and Ortho- 
clase. Mr. Teall writes that the residue from the sample of the 
lower marl band at Hitchin, submitted to him for examination, 
contained many grains of the last-mentioned mineral. 
