CONTENTS 



PAGE 



Introduction i 



History of discovery 3 



Description of the specimens 6 



Conclusion as to Camarocrinus 9 



Construction and probable origin of the bulbs 14 



Mode of union between plates in Scyphocrinus 19 



The American species of Scyphocrinus 21 



Description of the species 30 



Scyphocrinus elegans Zenker (Pis. I ; II ; III, figs. 1-4 ; IV ; V, figs. 1-5) 30 



Further remarks upon the fixed pinnules 40 



Scyphocrinus spinifer, new species (PI. IX, figs. la-c) 46 



Scyphocrinus mutabilis, new species (Pis. VI, figs. 3-19; VIII, figs. 3, 4, 5) 47 



Scyphocrinus stellatus (Hall) (PI. VII, figs. 4a, b) 49 



Scyphocrinus pratteni (McChesney) (Pis. VII, figs. la, b; VIII, figs. 1 2a, b) . . . 50 



Scyphocrinus pyburnensis, new species (Pis. VII, figs. 2a, b, 3; VIII, figs. 6a, b, 7). 52 



Scyphocrinus ulrichi, new species (PI. IX, figs. 2a, b) 54 



Scyphocrinus gibbosus, new species (PI. IX, figs. 3a, b) 55 



Explanation of plates 57 



