TAB. LXXII. 



CORALS OF THE SILURIAN FORMATION. 



Cystiphyllum siluriense (p. 297). 



Fig. 1. Side view of a specimen from Wenlock, belonging to the Geological 

 Society of London ; natural size. 

 la. Vertical section ; natural size. 



Cystiphyllum cylindricum (p. 297). 



Fig. 2. A subturbinate specimen from Dudley, belonging to the Geological Society of 

 London; natural size. 

 2a. Vertical section, amplified. 



2b. A broken specimen found at Dudley, by Mr. Fletcher ; natural size. 

 2c. A young specimen from the same locality and Collection ; natural size. 



CVSTJPHYLLUM GRAYI (p. 298). 



Fig. 3. A specimen from Dudley, belonging to the Collection of Mr. Fletcher ; 

 natural size. 

 3a. Its calice ; natural size. 



