Page 

 Fig. lo. Idiockinvs vEXTRicosrs W. and Sp. The orals represented by an un- 

 divided disk which is surrounded by five interradial plates not shown iu 

 the figure. (Same collection.) 205 



16. Platycki>-us symmeteicus W. and Sp. The orals almost symmetrical. 



(Same collection.) 94, 655 



17. 1'latvckixl's discoideus 0. and Sh. The orals more asymmetrical. (Same 



collection.) 88, 89, 94, 713 



18. Eretmocrixus coKONATus (Hall). The orals distinctly asymmetrical. (Same 



collection.) 88, 89 



19. Talauockinus decorxis W. and Sp. The posterior oral extremely large, 



the other four unrepresented. (Same collection.) 88 



20. DoRVCRiNus MississippiEXSKs Slium. The orals unusually asj-mmetrical. 



(Same collection.) 88, 89 



21. EuTROCHOCEiNus Christyi Shum. The orals excentric and asymmetrical. 



' (Same collection.) 88, 89 



22. Agabicoceinus Wortheni F. Roemer. The orals separated from one an- 



other by perisomic plates. (Same collection.) 88, 89 



23. Marsupiocrinus depressus Angel. The orals quite small and asym- 



metrically arranged. (Same collection.) 88, 89 



24. EuoDOCEiNus Whitei Hall. The orals altogether unrepresented. (Same 



collection.) 89 



25. Symbathoceixus Wachsmuthi M. and W. The orals asymmetrical, and 



supported by the upper muscle plates. (Same collection.) 89 



(Figures la, 4, 5, 6, 7, 8, and 16 enlarged | ; Figures 2, 3, and 15, ?.) 



