PLATE LI. 



Metacrinus nodosds, u. sp. 



Fig. 1. A young specimen, . . . . ■ 



Figs. 2-4. Faces of young internodal joints, . 



Fig. 5. The upper face of a young nodal joint, 



Figs. 6, 7. Radial and interradial views of a young nodal joint, 



Fig. 8. Portion of the stem, bearing a young coral, . 



Fig. 9. Upper face of a nodal joint, . . . • 



Fig. 10. Face of an internodal joint, 



Fig. 11. Side view of the middle portion of a pinnule, 



Fig. 12. The lower part of a pinnule-ambulacrum ; from above, 



