TAB. XI. 

 CORALS FROM THE GAULT. 

 CyATIIINA BOWERBANKII (p. 61). 



Fig. 1 . A weather-worn specimen ; natural size. 



1 a. A specimen showing the wall, but not the calicular margin. 



1 b. Horizontal section made near the calice, and magnified, to show the position 



of the pali, &c. 



Bathycyatiius Sowerbyi (p. 67). 



Fig. 2. Side view of a specimen, magnified, so as to show the structure of the wall. 

 The line placed on the side shows the natural size of the corallum. 



2 a. Calice magnified ; the upper half is represented in its natural state, but in the 



under half the septa have been cut down ; the centre is clogged up with 

 extraneous matter. 



Cyclocyathus Fittoni (p. 63). 



Fig. 3. Side view of the corallum, magnified. 



The line placed below shows the natural size of the specimen. 



3 a. Calicular surface, magnified. 



3 b. Under surface, or mural disc, magnified. 



Trochocyatiius Harveyanus (p. 65). 



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



4 a. Calicular surface, magnified. 

 4 b. Under surface, magnified. 



Trochocyathus conulus (p. 63). 



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



5 a. Calice, magnified. 



TllOCHOSMILIA SULCATA (p. 68). 



Fig. 6. Side view of a specimen, the upper part of which is broken on one side ; 

 natural size. 



6 a. Calice, magnified. 



6 b. A restored specimen, magnified. 



