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 Fig. 12. Terminal portion of a radial sinus, with the lancet-plate exposed by removal of 



the side plates. x 4 92 



Fig. 13. A similar example, with the lancet-plate removed, showing the general visceral 



cavity of the calyx. x 4 49 



Granatocrinus Norwoodi, O, §• S., sp., p. 245. 

 Fig. 14. Terminal portion of a radial sinus, with the lancet-plate and six side plates in situ. 



The hydrospire-plates and pores are well seen. Subcarboniferous, Iowa. x4 57 



Mesoblastus elongatus, G. B. Sby., sp., p. 186. 



Fig. 15. A radial sinus showing the lancet-plate, with the side plates removed, thus ex- 

 posing the hydrospire-plates and the pores. Carboniferous Limestone, Lanca- 

 shire, x 6 50 



Pentremites, sp. 



Fig. 16. Terminal portion of an ambulacrum, with some of the pinnules in situ. Subcar- 

 boniferous, Illinois. Coll. P. H. Carpenter. x 10 63 



Fig. 17. Another part of the same specimen, somewhat less broken. xlO 63 



