TAB. XX. 



CORALS FROM THE CORAL RAG. 



Protoseris Waltoni (p. 103). 



Fig. 1 . Side view, showing the under surface or common basal plate of the compound 

 corallum ; natural size. 



1 a. The same placed obliquely, so as to show the calicular surface. 



1 h. Calice, magnified. 



1 c. Costae, magnified. 



From a specimen belonging to M. Walton's collection. 



