308 
THE CRETACEOUS ROCKS OF BRITAIN. 
tlie latter not being so much in evidence in this example. 
A specimen from Park Farm, Londesboro’, also contains many shell- 
fragments. In the specimens from Speeton shell-fragments, foram- 
inifera, and spheres form from 15 to 25 per cent, of the rock. 
Examination of Washings. 
Coarse Material. 
Portions of several of the specimens obtained for chemical 
treatment were washed with water and the coarser organic 
remains which they contained were noted. As a whole they 
differ so little from those contained in the zone of Am. varians 
that detailed reference is hardly necessary. In no case was the 
chalk characterised by the occurrence of any organism in ex¬ 
ceptional abundance. 
As one may expect from the description of the sections, the quantit y 
of coarse material obtained was usually small. Several attempts 
were made to separate the coarse material and to estimate its per¬ 
centage to the amorphous matter, but repeated drying and washing 
failed to break up small hardened masses of chalk and the separa¬ 
tion was never completed satisfactorily. 
Shell-fragments. —The shell-fragments, as before, were chiefly 
prisms of Inoceramus, while here and there part of a Pecten, Rhyn- 
chonella or Terebratula occurred. In nearly all specimens minute 
spines referable to Hemiaster or Pseudodiadema were found. In 
that from Telegraph Hill, near Cerne, there were a number of 
spines of a kind not noted in any other locality. They somewhat 
resemble the fistulous spine of Diadcma figured by Wright (plate 
xiv., fig. 2, c., British Fossil Cret. Echinodermata, Palceont. Soc.). 
Coprolites, Fish-teeth or scales were rare. 
Sponge-spicules do not occur, with the exception of some glau¬ 
conitic rods, and are not recorded from any locality. Fragments of 
Bryozoa occur less commonly than in the Chalk Marl. 
Fora minifera.— The species isolated from the washings and 
residues of this zone, were identified by Mr. F. Chapman. 
They are distributed amongst thirty-three genera, as follows : — 
Family. 
Genera. 
No., of 
species. 
— 
Miliolidae 
Nubecularia - • - 
1 
New species. 
Spiroloculina - 
2 
Miliolina 
1 
New species. 
Astrorhizidae 
Rhizammina - 
2 
One new species. 
Lituolidae 
Reophax - 
1 
Haplophragmium - 
4 
One new species. 
Placopsilina - 
1 
Lituola - 
1 
Ammodiscus - 
4 
Trochammina 
2 
One new species. 
