ON THE BRITISH FOSSIL CORALS. 97 
Genus Favia, 
This genus has absorbed the Parastree, so that P. stricta has become 
Favia stricta, 
Favia minutissima, Dunean. 
The corallum is incrusting, gibbous, andsmall. The calices are very small, 
close, and with very scanty intercorallite tissue. There are twelve septa, 
and the cost are continuous. 
Diameter of the calices under 54, inch. 
Locality. Haldon, 
Tn the collection of the Geological Society. 
This is the smallest of the Favie. 
Genus THAMNASTR2A, 
Thamnastrea superposita, Michelin, sp. 
MM. Milne-idwards and Jules Haime thus notice this species (Hist. Nat. 
des Corall. vol. ii. p. 559) :— 
*M. Michelin’s specimen is very young. It is encircled by a strongly 
folded epitheca, which is formed of two layers. No columella is distinguish- 
able. The septa are tolerably strong and unequal. There are three cycles, 
with the rudiments of a fourth in one or two systems.” 
The superposition of the calices is remarkable ; and I cannot but place a 
coral found in the Irish Upper Greensand by Ralph Tate, Esq., F.G.S., in 
this species. 
Locality. Ireland, Upper Greensand. 
In the collection of R. Tate, Esq., F.G.S, &c. 
Fossil Corals from the Red Chalk of Hunstanton. 
The Red Chalk of Hunstanton contains several forms of Madreporaria. The 
small fauna has this peculiarity ; its species belong to the group of Fungide 
without exception. The specimens are small, usually much worn at the 
calicular end, and are readily distinguished by their mammiliform appearance 
and white colour. 
There are no compound Fungide in the Red Chalk, but such small, simple 
forms as would now characterize the presence of physical conditions unfayour- 
able for coral-life. The recent simple Fungide are found at all depths ; vast 
numbers of them are to be collected in the Gosau Lower Chalk ; a few existed 
in the Upper Greensand and the Neocomian, and are found in the existing 
coral-fauna; none are found in the West-Indian seas, whilst the Red Sea, 
Pacific, and Indian oceans abound with them. It is probable that peculiar 
conditions are necessary for their development. 
List of species in the Red Chalk of Hunstanton. 
1. Micrabacia coronula, Goldfuss, sp. 3. Podoseris mammilliformis, Duncan. 
var. major. elongata, Duncan. 
—, var. j 
2. Cyclolites polymorpha, Goldfuss, sp. 
Family FUNGID2. 
Subfamily Funera. 
Genus Micrapacta. 
There are specimens of a small form of Micrabacia coronula, Goldfuss, Sp-, 
and of a large variety, in the red rock; the species is well known in the 
_ Upper Greensand of England, and in the Chalk of Essex. There is another 
