TAB. LIX. 
CORALS OF THE SILURIAN FORMATION. 
PLASMOPORA PETALIFORMIS (p. 253). 
Fig. 1. | Upper surface of a specimen found at Dudley, belonging to the Parisian 
Museum ; natural size. 
la. Under surface of the same; natural size. 
14. A magnified portion of the surface of another specimen, found also at Dudley, 
and belonging to the Collection of Mr. John Gray, in which the calices 
are more distant, than in the preceding specimen. 
le. Vertical section of the specimen figured in | and la. 
PLASMOPORA SCITA (p. 254), 
Fig. 2. Upper surface of a specimen from Dudley, in the Collection of Mr. John 
Gray ; natural size. 
2a. Calices, magnified. 
Propora TUBULATA (p. 255). 
Fig. 3. Side view of a specimen from Wenlock, belonging to the Museum of Paris ; 
natural size. 
3a. Calices, magnified. 
36. Part of a vertical section, magnified. 
