Dr. Chas. A. White—On a New Cretaceous Coral. 8568 
Mexico; and probably represents approximately the Upper Chalk 
of England. Regarding it as a new generic form I herewith give a 
diagnosis and figures of it; and being the only species known to 
me, the diagnosis is necessarily based upon this alone. 
HINDEASTR#A, gen. nov. 
Corallum depressed or discoid, simple in the earlier stages of 
growth, but afterward becoming compound by gemmation ; basal 
epitheca marked by both radiating striae and concentric rugz : 
corallites few, without true columella, their outer walls fused 
together when in contact, and moderately strong; radiating septa 
bilaminate, subequal in thickness at their peripheral ends, consisting 
of three or four cycles as regards their length, subspinulose, tuber- 
culose, or rugose upon their sides and upon their free upper edges ; 
dissepiments few or absent. 
Fig. 
Fig. 
Fig. 
Calicular view of the largest example discovered. 
Lateral view of the same. 
. Calicular view of a medium sized example. 
Fig. 4. Under view of the same, showing the basal epitheca. 
Fig. 5. Calicular view of a corallite upon which no gemmation has occurred. All 
the figures are of natural size. 
This genus is related to Isasirea, HE. and H., but it differs from 
the latter in its mode of growth, Isastrea being massive, and the 
dissepiments of its corallites being usually numerous and well 
developed. The extreme shortness of the axis of the corallites of 
Hindeastrea gives little or no space for the development of dissepi- 
ments. The walls of the corallites also form more distinct 
boundaries between the calices than is usual in Isastrea. 
The generic name is given in honour of Dr. G. Jennings Hinde. 
on He 09 29 FS 
HINDEASTR#A DISCOIDEA, Sp. NOV. 
Corallum irregularly discoid or much depressed, attached by the 
apex of the original corallite, or free; corallites few, very short but 
moderately broad; the walls of the adjacent corallites usually in 
contact and fused together, when the border is polygonal ; but they 
sometimes have a tendency to separate, when the border is sub- 
circular; calices slightly concave or nearly flat; their borders more 
or less prominent and clearly defined; radiating septa prominent, 
