VI TABLE OF CONTENTS. 



Structure :in<i anatomy — Continued. 



Organization of tho crinoids — Continued. Page. 



Ccelora 190 



Promachocrinus and Thaumatocrinu.'i 191 



Calcareous structures 194 



Skeleton as a whole 194 



Column 198 



Centrodorsal 219 



Cirri 258 



Infrabasals 313 



Basals, and structures formed from and associated with them 316 



Radianal 331 



Interradials; anal 335 



PerLsomic internwlials 339 



Primary plates of the disk 339 



Orals .'. 340 



General proportions of calyx and its contents 341 



Radials 348 



Explanation of plates 383 



Index 389 



