PLATE 72. 
Fig. 1. 679. 3. Diplophylltjm coralliferum. (Pag. 322.) 
1 a. The ends of numerous stems of this coral, enclosed in a mass of Strom ATor ora. 
1 b, c. Enlargements from different cells of this coral. 
Fig. 2. 681. 2. Stromatofora constellata. (Pag. 324.) 
2 a. A portion of the surface of one of these masses, showing the nodose stellate laminae. 
2 b. An enlargement of the surface of two of these nodes. 
Fig. 3, 4. 680. 1. C olemnaria inequalis. ( Pag. 323.) 
3 a. A part of the surface of a small irregular mass, showing fewer young cells than is usual. 
3 b. Several of the same enlarged. 
4 a. A portion of a specimen showing the prismatic structure of the coral. 
4 6. A weathered portion enlarged, showing the cellular structure. 
4 c. A reversed figure, the lower extremities of several columns enlarged, showing the mode of weathering, 
and the structure after the removal of the exterior cellular area. 
