= 
a 
— 
SS Oe ee ofS 
Se 
(2) 
PLATE IV. 
CORALS FROM THE CHALK. 
The corallum of Zrochosmilia (Culosmilia) granulata, Duncan. (P. 10.) 
The costa, magnified. 
The cellular margin, magnified. 
The peduncle, magnified. 
The corallum of Zrochosmilia (Celosmilia) Woodwardi, Duncan. (P. 9.) 
The coste, magnified, 
The septa, magnified. 
The peduncle, magnified. 
The corallum (nat. size and enlarged) of a variety of Trochosmilia (Celosmilia) laxa, 
Ed. andH. (P. 8.) 
The cost, magnified. 
The calive, magnified, showing the septa of the fourth cycle. 
