TAB. VII. 



CORALS FROM THE LONDON CLAY. 



LlTHAR.EA WEBSTERI (p. 38). 



Fig. 1. A mass of this compound corallum adhering to the surface of a pebble; 

 natural size. 

 1 a. Calicular surface, magnified. 

 1 b. Vertical section of two corallites, magnified to show their internal structure. 



1 c. A transverse section made at a considerable distance below the calice, and 



magnified so as to show the structure of the columella, the septa, and the 

 Avails. 



UoLAR.EA PARISIENSIS (p. 40). 



Pig. 2. A fragment of this cylindroicl compound corallum magnified ; the length of the 

 line placed below indicates its real diameter. 



2 a. Transverse section of the compound corallum, showing the vertical section of 



the corallites, magnified. 



MorsEA COSTATA (p. 42). 



Fig. 3. A large specimen; natural size. 



3 a. A fragment, magnified. 



Graphularia Wetiierelli (p. 41). 



Fig. 4. Fragments of the quadrangular portion of the sclerobasis; natural size. 



4 a. A fragment of the cylindrical portion of the same. 

 4 h, 4 c. Fragments of both forms, magnified. 



4 d, 4 e. Transverse sections of the same magnified, so as to show their radiate 



structure. 



Websteria crisioides (p. 43). 



Fig. 5. Fragment of a branch; natural size. 



5 a. Portion of the same, magnified. 



