488 ON CARBONIFEROUS ENCRINITES. 



From that species it differs entirely in shape, in its smaller size, in 

 the narrowness of the sub-radials, and in the presence of the 

 tubercles on the body plates. 



Height, nearly -7 inch. 



Diameter across arms 1 inch. 



Diameter across base -5 inch. 

 This specimen comes from Clitheroe. 



EXPLAJS'ATrOiN' OF PLATES. 



PLATE VI. 



1. Poteriocrinus plicatus, (Austin), natural size. 



2. Anal plates of ditto. 



3. Portion of proboscis of ditto, enlarged. 



4. Another specimen, shewing stem and side arms. Reduced in size. 



PLATE VII. 



1. Poteriocrinus plicatus. Proboscis from a slab, with three heads and 



seven stems. 



2. Detached plates of proboscis of ditto, on the same slab as Plate VI., 



fig. 1. 



3. Poteriocrinus rugosus. n. sp. 



4. Side view of the same, shewing anal plates, 



5. Base of ditto. 



6. Ehodocrinus verus. (MiUer.) 



7. Plates of ditto, enlarged. 



8. Hhodocrinus verisimilis. n. sp. 



9. Ditto. 



10. Arrangement of plates of ditto. 



11. Gilbertsocrinus Koninckii. n. sp, 



12. Arrangement of plates of ditto. 



13. Plates round the arm-bases of ditto. 



