PLATE VIII. 



cp, covering plate. sp, side plate. 



I, wing of joint of pinnule. '. tentacle. 



1. Profile view of side plates and covering plates near middle of arm. 



2. View from above of covering plates nearer base of arm than Fig. 1. 



8. View from above of covering plates from the arm beyond the last fork. 



4. View from above of covering plates from the arm on the proximal side of the last fork, showing 



opening for the passage of the tentacle. 



5. Slightly oblique view of two of the covering plates from nearly the same part of the arm as Fig. 4, 



to show the opening for the passage of the tentacle. 



6. Profile \ iew of covering and side plates and tentacles near the third fork of the arm. 



7. A. part of the arm furrow seen from above, to show the arrangement of the tentacles. 



S. Side view of the basal part of one of the pinnules near the disk, to show the covering and side 

 plates. 



9. \ part of the same pinnule as Fig. 8, seen from above. 



10. Profile of side and covering plates of a pinnule near the end of the arm proximal to last fork. 



11. Ambulacra! groove of arm between the second and third forks. 



