VI TABLE OF CONTENTS. 



Structure and anatomy Continued. 



Organization of the crinoids Continued. p age . 



Coelom - - 190 



Promachocrinus and Thaumatocrinus 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 



Perisomic interradials 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 



