TAB. V. 



CORALS FROM THE LONDON CLAY. 



Stylocgbnia eriarciata (p. 30). 



Fig. 1. A small mass of this compound corallum ; natural size. 



la. A portion of the calicular surface of the same, magnified. 

 This specimen is somewhat weather-worn. 



Stylocosnia Monticularia (p. 32). 



Fig. 2. A small, somewhat gibbose mass of this compound corallum ; natural size. 

 2 a. A portion of the calicular surface, magnified so as to show the structure of the 

 calices and of the marginal processes. 



2 b. Transverse section of the compound corallum, slightly magnified, to show the 



cavity circumscribed by its under surface. 



Asi'ROCCENIA pulchella (p. 33). 



Fig. 3. A small mass of this compound corallum, in which most of the corallites have 

 been pressed together so that their calicular edges have become polygonal 

 and completely united ; natural size. 



3 a. Another group, in which most of the corallites have preserved their original 



circular form and free calicular margin. 

 3 b. A portion of the specimen fig. 3, magnified. 



3 c. A portion of the specimen fig. 3 a, magnified. 



Stereopsammia humilis (p. 37). 



Fig. 4. A group of corallites ; natural size. 



4 a. Terminal portion of some of these, magnified. 

 4 b. Calice, magnified. 



