PLATE LI. 
METACRINUS NODOSUS, 0. 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, 
g I 
Diam. 
nat. size 
<a: 
x 14 
x 14 
x 6 
<eO) 
x 10 
xe 
Xs 
