TABLE OF CONTENTS. 



INTRODUCTORY PART. 



Page 



Introduction , , 1_10 



Historical 11-31 



Terminology 32-37 



MORPHOLOGICAL PART. 



Primary and Supplementary Plates 38 



The Plates of the Abactinal System 38-88 



The Stem and its Appendages . 38-52 



Basals and Infrabasals .... 52-73 



The Radials 68-73 



The Arms and Pinules .... 73-88 

 The Plates of the Actinal System 88-104 



The Orals 88-89 



Mouth and Ambulacra 99 



The Supplementary Plates . . . 105 

 The distribution of the Plates and 

 their relations to the different 



groups 105-123 



The Anal Plates and the Anus . 124-139 

 Internal Cavity of the Calyx 140-142 

 The Chambered Organ and the 



Axial Canals 140 



The Convoluted Organ 143 



SYSTEMATIC PART. 



Classification 144-172 



Definition of the Crinoidea and their 



Primary Subdivisions . . . .169 

 Analysis of the Families . . . . 170 

 Geological and Geographical Distri- 

 bution of the Camerata . . . 1 72 

 Descriptive. 



Reteocrinidae 173-187 



Analysis of the Genera 173 



Geological and Geographical Dis- 

 tribution 173 



Reteocrinus 176 



Xenocrinus 182 



Tanaocrinus 185 



Thysanocrinidae 188-214 



Analysis of the Genera 188 



Geological and Geographical Distri- 

 bution 188 



Thysanocrinus 190 



Ptychocrinus . 197 



Hyptiocrinus 200 



Idiocrinus 202 



Lampterocrinus 207 



Siphonocrinus 209 



Rhodocrinidae 215-263 



Analysis of the Genera 215 



Geological and Geographical Distri- 

 bution 216 



Rhodocrinus 218 



Gilbertsocrinus 233 



Thylacocrinus 248 



Diabolocrinus 249 



Archseocrinus 253 



Rhaphanocrinus 258 



Lyriocrinus 261 



Melocrinidae 264-329 



Analysis of the Genera .... 264 

 Geological and Geographical Distri- 

 bution 265 



Melocrinites 267 



Gl^^ptocrinus . 267 



Perigl^'ptocrinus 277 



Stelidiocrinus . . . . . . . 279 



Mariacrinus 281 



Macrostylocrinus 285 



Melocrinus ........ 292 



Dolatocrinites 304 



Technocrinus 304 



Allocrinus 306 



Centrocrinus ....... 308 



Dolatocrinus 310 



Stereocrinus 324 



Hadrocrinus . 327 



Calyptocrinidae ...... 330-359 



Analysis of the Genera 330 



Geological and Geographical Distri- 

 bution 330 



Eucalyptocrinus 332 



CaUicrinus 353 



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