PLATE III. 



Schizoblastus Sayi, Shumard, sp., p. 224. „ 



Page 



Fig. 1. Summit view, showing the concave constricted apices of the deltoids, partially 



exposed lancet-plates, small slit-like spiracles, anus, and uncovered mouth. 



Suhcarboniferous, Iowa. Coll. Wachsmuth. x 4 110 



Fig. 2. Another specimen, with the mouth closed by the dome of small vault-plates, which 



extends outwards on to the ambulacra. Suhcarboniferous, Iowa. Coll. 



Wachsmuth. x 4 67 



Fig. 3. The same, more magnified. x 8 67 



Pentremites conoideus, Hall, p. 162. 



Fig. 4. The calyx, with a portion of the shell removed, showing externally an ambulacrum 

 extending along its entire length, but on the internal cast the relief of two 

 ambulacra for only three parts of the length. Suhcarboniferous, Indiana. 

 x2 . . . . 95 



Fig. 5. Portion of a radial plate, with the apex of an ambulacrum, seen from the outside. 



Suhcarboniferous, Indiana. x 2 95 



Fig. 6. Internal view of the same specimen, showing the hydrospires partially imbedded 



in the substance of the plate. x 2 95 



P. conoideus, var. Koninckanus, Hall, var., p. 162. 



Fig. 7. Portion of a radial plate, with the apex of an ambulacrum, as seen from without. 



Subcarboniferous, Indiana. x 6 95 



Fig. 8. The same seen from within, showing the hydrospires partly imbedded in the 



substance of the plate. x 6 95 



Fig. 9. Side view of a broken calyx with the interior exposed, and showing the relation 



of the hydrospires to the radials. Subcarboniferous, Indiana. x 4 ... 94 



Fig. 10. Summit view of an internal cast. Subcarboniferous, Alabama. Coll. Wachsmuth. 



x8 101 



Fig. 11. Interradial view of the same specimen. x8 101 



Fig. 12. Anal side of the same. x 8 101 



Metablastus Wortheni, Hall, sp. (fide Wachsmuth). 

 Fig. 13. Portion of a crushed example with the pinnules in situ, and spreading out above 

 the summit. [The radio-deltoid sutures have been represented in this figure 

 by mistake ; they are probably only cracks, and the interradial sutures should 

 extend the whole length of the calyx.] Subcarboniferous, Indiana. Coll. 

 Wachsmuth. x 2 63 



Metablastus lineatus, Shumard, sp., p. 199. 

 Fig. 14. View of the summit, showing the ten elongately-oval spiracles. Subcarboniferous, 



Iowa. Coll. Wachsmuth. x4 Ill 



Fig. 15. Anal side of the same specimen. x4 110 



Granatocrinus Norwoodi, O. ty S., sp., p. 245. 

 Fig. 16. View of the greater portion of the base of the calyx, with a part of the stem in situ. 



Subcarboniferous, Iowa. Coll. Wachsmuth. x2 9 



