8 



CONTENTS. 



Incertae Sedis (conliniml). 

 Xenocidaris Schultzc . 



A', clavigera Schultzc. Genotype 



454 

 455 



X. conifera Schliiter . 

 X. cylindrica Schultze 



455 

 456 



Nomina Nuda 



Archaeocidaris tirolensis Staclie 

 Echiiwcnmis cidariformis (?) T. and T, 

 Austin 



Echinocrinu/i immum T. and T. Aust 

 Heterocidaris Hall . 

 Hetcrocidnns keokuk Hall 

 Heterocidaris laevispiiia Hall 



450 



45(3 

 456 

 456 

 456 

 456 



456 



Lepidocentrus desnri DoUo and Bnisseret . 457 



Lepidocentrus duponli Dollo and IJuisseret . 457 



Lepidoccntrus gaudryi Dollo and Buisseret . 457 



Meloniles youngi Young .... 457 



Palacchinus agassizi Dollo and Buisseret . 457 



Palaechinus carpenleri Dollo and Buisseret 458 



Palaechinus loveni Dollo and Buisseret . 458 



Palaeozok' Fokms Incourkctly Refeiired to Echim 



Discocystis Gregory 458 



D. kaxkaskiensis (Hall) .... 4.58 



D. op/alus (Worthen and Miller) . . 4.58 



D. sampsoni (Miller) .... 485 



Myriastiches Solla.s 



M. gigas SoUas 

 Palaechinus sp. Mitchell 

 Spatangopsis Torcll . 



S. costata Torell 



458 

 458 

 4.58 

 458 

 458 

 458 



BIBLIOGRAPHY 459 



INDEX 475 



ERRATA AND ADDENDA 491 



