PLATE XLVII. 



Figs. 1-5. Metacrinus wyvillii, n. sp. 



Figs. 1,2. Portions of the stem, .... 



Figs. 3, 4. Upper and lower faces of an infra-nodal joint, 

 Fig. 5. Upper face of a nodal joint, .... 



Figs. 6-9. Metacrinus varians, n. sp. 



Fig. 6. Portion of the stem, commencing with an infra-nodal joint 

 and inverted, ..... 



Figs. 7, 8. Lower and upper faces of a supra-nodal joint. 



Fig. 9. Upper face of a nodal joint, .... 



Fig. 10. The end of a pinnule; from above, . 



Fig. 11. The lower part of a pinnule ; from the side, . 



Fig. 12. The arm-groove and brachial ambulacrum, 



Fig. 13. Metacrinus costatus, n. sp. 

 Fig. 13. The lower part of the ambulacrum of a middle pinnule, 



10 



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