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 Fig. 15. Idiocrinus venteicosus W. and Sp. The orals represented by an un- 

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

 the figure. (Same collection.) 205 



16. Platyceinus symmetricus W. and Sp. The orals almost symmetrical. 



(Same collection.) 94 ; 555 



17. Platyceinus discoideus 0. and Sh. The orals more asymmetrical. (Same 



collection.) 88, 89, 94, 713 



18. Eretmocrinus coeonatus (Hall). The orals distinctly asymmetrical. (Same 



collection.) 88, 89 



19. Talaeocrinus decornis W. and Sp. The posterior oral extremely large, 



the other four unrepresented. (Same collection.) 88 



20. Dorycrinus mississippiensis Shum. The orals unusually asymmetrical. 



(Same collection.) 88, 89 



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



(Same collection.) 88, 89 



22. Agaeicocrinus Woetheni P. Roemer. The orals separated from one an- 



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



23. Maesupioceinus depeessus Angel. The orals quite small and asym- 



metrically arranged. (Same collection.) 88, 89 



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



collection.) 89 



25. Symbathocrinus 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 f ; Figures 2, 3, and 15, f .) 



