﻿PLATE 
  XXVIII. 
  

  

  Page. 
  

   Tig. 
  1. 
  Zeaceinus 
  Coxanus 
  302 
  

  

  Anterior 
  view 
  of 
  the 
  body, 
  arms 
  and 
  tentacula, 
  and 
  a 
  portion 
  of 
  the 
  column, 
  

   natural 
  size. 
  

  

  Fig. 
  2. 
  POTERIOCRINUS 
  ASPERATUS 
  280 
  

  

  Posterior 
  view 
  of 
  the 
  body, 
  arms 
  and 
  tentacula, 
  and 
  a 
  portion 
  of 
  the 
  

   column, 
  natural 
  size. 
  

   Fis. 
  3. 
  Zeaceinus 
  Keokuk 
  303 
  

  

  Anterior 
  view 
  of 
  body 
  and 
  arms, 
  natural 
  size. 
  

   Pig. 
  4. 
  Poteeioceinus 
  Otteeensis 
  283 
  

  

  Side 
  view 
  of 
  a 
  crushed 
  specimen, 
  aud 
  a 
  part 
  of 
  the 
  pentagonal 
  column. 
  

   Fig. 
  5. 
  Cyathoceinus 
  paevibrachiatus 
  309 
  

  

  Anterior 
  view 
  of 
  the 
  body, 
  arms, 
  and 
  a 
  part 
  of 
  the 
  column, 
  natural 
  size. 
  

  

  Fig. 
  6. 
  POTEEIOCEINUS 
  LATIDACTYLUS 
  275 
  

  

  Side 
  view 
  of 
  the 
  body, 
  a 
  part 
  of 
  the 
  arm?, 
  and 
  upper 
  portion 
  of 
  the 
  column, 
  

   natural 
  size. 
  

  

  Fig. 
  7. 
  Rhodocrinus 
  Coxanus 
  305 
  

  

  Posterior 
  view, 
  natural 
  size. 
  

  

  Fig. 
  8. 
  POTEEIOCEINUS 
  BUEKETI 
  270 
  

  

  Anterior 
  view 
  of 
  body 
  and 
  arms. 
  

   8 
  a. 
  Posterior 
  view 
  of 
  another 
  individual 
  showing 
  the 
  ventral 
  tube 
  and 
  column. 
  

  

  Fig. 
  9. 
  POTERIOCRINUS 
  PENICILLIFOBMIS 
  276 
  

  

  Posterior 
  view 
  of 
  a 
  nearly 
  perfect 
  individual, 
  natural 
  size. 
  

   Fig. 
  10. 
  POTEEIOCEINUS 
  Nauvooensis 
  282 
  

  

  Side 
  view 
  of 
  a 
  crushed 
  specimen, 
  natural 
  size. 
  

  

  Fig. 
  11. 
  POTEEIOCEINUS 
  TENTACULATUS 
  277 
  

  

  Posterior 
  view, 
  natural 
  size. 
  

  

  Fig. 
  12. 
  P 
  OTEEIOCRINUS 
  ARACHNiEFOBMIS 
  281 
  

  

  Posterior 
  view 
  of 
  the 
  body 
  and 
  a 
  portion 
  of 
  one 
  of 
  the 
  arms, 
  natural 
  size. 
  

  

  Fig. 
  13. 
  POTEEIOCEINUS 
  TENUIDACTYLUS 
  271 
  

  

  Anterior 
  view 
  of 
  the 
  body 
  and 
  a 
  part 
  of 
  the 
  arms, 
  natural 
  size. 
  

  

  Fig. 
  14. 
  Eretmoceinus 
  Vabsoviensis 
  30C 
  

  

  Side 
  view 
  of 
  the 
  body 
  with 
  arms 
  complete, 
  and 
  a 
  part 
  of 
  the 
  column, 
  natu- 
  

   ral 
  size. 
  

  

  Fig. 
  15. 
  POTERIOCRINUS 
  VARSOVIENSIS 
  290 
  

  

  Side 
  view 
  of 
  the 
  body 
  and 
  a 
  part 
  of 
  the 
  arms 
  and 
  column, 
  natural 
  size. 
  

  

  Fig. 
  16. 
  POTEEIOCEINUS 
  YALEDUS 
  287 
  

  

  Anterior 
  view 
  of 
  the 
  body 
  and 
  a 
  part 
  of 
  the 
  arms 
  and 
  column, 
  natural 
  size. 
  

   Fig. 
  17. 
  POTEEIOCEINUS 
  Illinoiensis 
  289 
  

  

  Posterior 
  view 
  of 
  the 
  body 
  and 
  part 
  of 
  the 
  arms, 
  natural 
  size. 
  

  

  