TAB. LVII. 



CORALS OF THE SILURIAN FORMATION. 



PaljEocycltjs porpita (p. 246). 



Fig. 1. Upper surface of a specimen found at Dudley; Collection of Mr. Fletcher; 

 natural size. 



1 a. Lower surface of another specimen found at Dudley ; Collection of Mr. Fletcher ; 

 natural size. 



\b. Side view of the specimen figured in 1 ; natural size. 



\c. Upper surface of the specimen figured in 1 ; magnified. 



Pal^eocyclus ppwEacutus (p. 247). 



Fig. 1. Upper surface of a specimen found at Marloes Bay, and belonging to the 

 Collection of the Geological Society of London ; natural size. 

 2a. Lower surface of the same ; natural size. 

 2(5. Side view of the same ; natural size. 

 2c. A part of the upper surface, magnified. 



Paljeocyci/us Fletcheri (p. 248). 



Fig. 3. Side view of a young specimen ; natural size. 



3a. Upper surface of the same ; natural size. 



33. Upper surface of an adult specimen; natural size. 



3c. Side view of a young elongate specimen. 



2>d. Side view of an adult specimen ; natural size. 



Se. A specimen bearing two young ones ; natural size. 



3/. Part of the upper surface of 35, magnified. 



All these specimens were found at Dudley, and belong to the Collection of 

 Mr. Fletcher. 



Pal^Ocyclus rugosus (p. 248). 



Fig. 4. Side view of a small specimen ; natural size. 



4a. Upper surface of another specimen ; natural size. 

 4<b, 4c. Side views of two elongate ones ; natural size. 

 4d. Part of the upper surface of 4a, magnified. 



These various specimens were found at Dudley, and belong to the Collection 

 of Mr. Fletcher. 



