GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE NIAGARA GROUP. 



No. 19. 

 Fig. 4. Caryocrinus ornatus. 

 Figs. 5 and 6. Interior structure of the plates. 

 Fig. 7. Part of a plate enlarged, showing the pores which communicate with the external 



surface. 



No. 20. 

 Fig. 1. Anatomical structure of the Caryocrinus ornatus. 



Fig. 2. Arrangement of the capital plates, showing the moutli composed of several conical 

 plates. 



No. 21. 



Fig. 4. Cyathocrinus ? 



Fig. 4 a. Anatomical structure of the same fossil. 



Fig. 5 a. b. Cyathocrinus? These two species have not been determined. 



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