PLATE 37 A. 
pjg. i. 523. L Stromatopora concentrica. (Pag. 136.) 
The base of a large individual of this species. 
Fig. 2. 567. 1. Lichenalia concentrica. (Pag. 171.) 
2 a. A nearly perfect frond. 2 b. An enlargement of the surface of the same. 
