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DESCRIPTION OF PLATE. 
Fig. 1. Side view of a specimen of Porocrinus Smithi, without arms or 
column. 
Fig. 2. An imperfect specimen, haying a membrane covering two of the 
hydrospires. 
Fig. 3. Flattened specimen, with portions of arms and column. 
Figs. 4 and 5. Sections of column showing size of central canal, &. 
Fig. 6. Summit structure of specimen shown in Fig. 1. 
Fig. 7. One of the sub-radial plates enlarged. 
Fig. 8. Diagram. 
Fig. 9. Specimen of Agelacrinites Dicksoni from the Cabinet of Dr. Grant. 
