EXPLANATION OF THE PLATE, 



1. Rhizocrinua Rawsonii, without root-portion of stem. 



2. Stem of another specimen, with root-portion. 



3. Articulating surface of a joint of the stem. 



4. Calicle, showing basals anil first and seconrl r.adials. 



5. Upper surface of calicle, with second radials. 

 C. .Same, after removal of second radials. 



7. Two arms, between them the peristome. 



8. Arm of Rbizocrinus lofotensla. 

 0. Base of pinnide of R. Rawsonii. 



10. Pinnule of the same, dorsal view. 



11. Same with base, more magnified. 



12. Same, lateral view, 



13. Pinnule of R. lofotensis, lateral view. 



14. Mouth and anus of R. RaWBonii. 



