TAB. VIII. 



CORALS FROM THE UPPER CHALK. 



Parasmilia centralis (p. 47). 



Fig. 1. A young specimen; natural size. 



1 a. The same, magnified to show the structure of the wall. 



] b. Vertical section, magnified, so as to show the structure of the columella, the 



dissepiments, &c. 

 1 c. Calice, magnified; 1, septa of the first cyclum; 2 secondary septa; 3, septa of 

 the third cyclum ; 4, 5, septa of the fourth and fifth orders, constituting the 

 fourth cyclum. 



1 d, 1 e. Specimens remarkable by their great length. 



Parasmilia Mantelli (p. 49). 



Fig. 2. Side view of the corallum ; natural size. 



2 a. The same, magnified. 



Parasmilia serpentina (p. 51). 



Fig. 3. Side view of the corallum; natural size. 



3 a. Calice, magnified. 



3 b. Portion of the wall, magnified. 



Cgelosmilia laxa (p. 52). 



Fig. 4. Side view of the corallum ; natural size. 



4 a. A specimen, the growth of which has been intermittent ; natural size. 

 4 b. The specimen No. 4, magnified, to show the structure of the wall. 



4 c. Calice, magnified. 



Parasmilia cylindrica (p. 50). 



Fig. 5. Side view of the corallum; natural size. 



