TAB. LVII1. 

 CORALS OF THE SILURIAN FORMATION. 



Heliolites Graii (p. 252). 



Fig. 1. A portion of a large specimen found at Walsall, belonging to the Collection 

 of Mr. John Gray ; natural size. (Restored by means of several fragments.) 

 la. Part of the surface, magnified. 



Heliolites megastoma (p. 251). 



Fig 2. A portion of a specimen found at Wenlock Edge, in the Collection of 

 the Museum of Paris ; natural size. 

 2a. Part of its surface, magnified. 

 2b. Vertical section of the same, magnified. 

 2c. Surface of a cast found at Coniston, in the Collection of the Geological 



Society of London ; natural size. 

 2d. Part of the same, magnified. 



