CORAL FAUNA OF HALDON, DEVONSHIRE. 95 
corals allied to the Turbinarians of the Red Sea and Pacific, through 
Astreopora of the European Eocene deposits. All the hitherto 
known species here come from the Cretaceous series at Gosau and 
Figuiéres, which are the geological equivalents of Haldon ; but the 
new species differ from the others, and have the granules or spinules 
between the calices, and which are in the position of cost, in greater 
number than the septa. 
Oroseris has hitherto been known as a genus of Jurassic age, and 
of the Oligocene or Kocene and Miocene. D’Orbigny has described 
a doubtful species from the Neocomian, and that now presented 
clearly fills up a part of the gap in the continuity of descent. The 
genus is extinct. The coste are double the septa in number. 
The species of the genus Y'rochoseris have a great range in time 
and space. The first which appeared was in the Hippurite Chalk 
and came from Gosau; the type was continued into the Eocene, and 
a recent species lives amongst the Philippines. The new species 
are thoroughly distinct from the others. 
Heliopora, formerly a tabulate Madreporarian genus, has now, 
under the admirable study of Moseley, been placed amongst the 
Aleyonaria. Its only living species is the blue Heliopora of the Pacific 
reefs, which is, usually, in the shape of lobed tufts or digitate fronds, 
Moseley has shown that its septa are very short and vary from 12 
to 16. Several fossil Tabulata closely resembling Heliopora cerulea, 
Grimm, sp., have been described; and it is certainly curious that 
some nine of them should have come from the horizon of Gosau 
and Uchaux in the Hippurite Chalk. Others are supa-cretaceous, 
some being found in the Eocene. Reuss, apparently believing that a 
modern genus could not have been represented in the age of Hip- 
purites, called one Polytremacis, and established several species ; but 
MM. Milne-Edwards and Jules Haime restored some of the forms to 
Heliopora. The distinction was, that either the septa were 24 in 
number, or that there were traces of coste, or that the septa were 
long- or short-pointed. ‘These are not generic distinctions. Poly- 
tremacis is really Heliopora, although its species lived in the Turonian 
and Eocene. They are all probably descendants of Heliolites of the 
Paleozoic age. 
The Haldon fossils cannot be distinguished from the incrusting form 
of recent Helopora cerulea, and the shape of the corallum and some 
minor differences are the only distinctions between it and the type 
of MM. Milne-Edwards and Jules Haime. An incrusting form is 
in the British Museum. The colour of the fossil is rusty red. 
Remarks on the Fauna as a whole. 
The coral fauna of Haldon appears to be the northern expression 
of that of the French and Central-European deposits, which are the 
equivalents of the British Upper Greensand. It has but slight affi- 
nity with that of the Cambridge Greensand area, where the condi- 
tions do not appear to have been those favourable for a fringing reef. 
The Haldon deposit, so far as the corals are concerned, was a shallow- 
water one, and the zoophytes grew upon the rolled, broken, iittoral 
