MONOGRAPH OF THE EXISTING CRINOIDS. 



311 



Figs. 603-609, — Terminal combs of various comastkbids. 60:1 Nemaster iowensis, intekxal view. 



604. Same, bxteknal view. 605. Nemastee discoidea, external view. 606. Same, internal view. 



607. Nemastee hubiginosa, intkrnai, view. 608. Same, external view. 609, Saub, ventral view. 



142140— 21— Bull. S2 22 



