EXPLANATION OF THE PLATE 



1. Rhlzocrimis 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 basala and first and second radials. 



5. Upper surface of calicle, with second radial*. 

 ('<. Same, after removal of second radials. 



7. Two arms, between them the peristome. 



8. Arm of Rhizocrinus lofotensis. 



9. Base of pinnule of R. Rawsonii. 



10. Pinnule of the same, dorsal view. 



11. Same with hase. more magnified. 



12. Same, lateral view. 



13. rinnule of R. lofotensis, lateral view, 



14. Mouth and anus of R. Rawsonii. 



