PLATE 37 A. 



Fig. 1. 523. 1. Stromatopoea concentrica. (P^g- 136.) 



The base of a large individual of this species. 



Fig. 2. 567. 1. Lichenalia concentrica. (P^g- 171.) 



2 0. A nearly perfect frond. 2 6. An enlargement of the surface of the same. 



