PLATE XVI, CONTINUED. 



FIG. 11. A body, apparently of ferruginous lime-stone, having much of the appearance of 

 a pentacrinal vertebra. These bodies are worn by some of the Africans, 

 strung together and forming necklaces. 



12. The perpendicular section of a column, from Bradford, in which are seen the 



superadded coats, such as are also seen on the specimen, Fig. 5. In this spe- 

 cimen they are seen spreading out and giving an increase of thickness to the 

 lower part of the column. 



13. The perpendicular section of a beautiful agatine column, from Soissons, in which 



the superadded coats extending at the base of the column are very plainly per- 

 ceived, forming a body well calculated to be the base or organ of attachment 

 of this species of encrinite. - 



14. The section of the side of a column, from Bradford, in which the circumstances 



noticed in the preceding specimen are very evident *. 



15. A section of pentacrinal marble, shewing longitudinal sections of the vertebral 



columns. ' 



16. Vertebral columns, variously contorted, and connected together by lateral digital 



processes. 



* Since the finishing of this Plate, I have procured a transverse section of the base of this 

 species of encrinite, from Pfeffingen. It seems to yield similar appearances, except being 

 three times the size, and of a purple colour, inclining to red, with those which a transverse 

 section of the lower part of the French fossil, Fig. 13, might give. 



