Plate 21. 



1-6. Podopbora atrata Agass. 



1. Denuded test, seen from the actinal side. 



2. The same seen from the abactinal side. 



3. Seen iu profile facing the odd anterior ambulacrum. 



4. Seen from the actinal side. 



5. The same seen from the abactinal side. 



6. Profile of the same, facing the odd posterior interambulacrum. 

 All figures are natural size. 



The odd anterior ambulacrum occupies the center of the upper part of figures 1, 2, 4, 5. 

 Hawaiian Ids., A. Garrett coll. 



