Bulletin, Vanderbilt Marine Museum, Vol. IV 



Plate 88. 



Strongylocentrotus gibbosus (L. Agassiz and DeSor) : A, large, tridentate 



pedicellaria and detail of tip of valve; B, small, tridentate 



pedicellaria ; C, globif erous pedicellaria ; D, tip 



of actinal pedicel ; all x 30. 



