﻿EXPLANATION 
  OF 
  PLATE 
  

   APIOCRINUS 
  TEHUANTEPEC, 
  new 
  species 
  

  

  SPlo. 
  1. 
  Fragment 
  of 
  stem 
  containing 
  conical 
  enlargement 
  proximal 
  to 
  the 
  

   calyx, 
  tapering 
  for 
  a 
  distance 
  of 
  5 
  columnals 
  from 
  7 
  mm. 
  di- 
  

   ameter 
  to 
  10 
  mm. 
  X 
  -§- 
  . 
  

   2 
  and 
  3. 
  Stem 
  fragments 
  of 
  larger 
  individuals 
  from 
  more 
  distal 
  parts 
  of 
  

  

  the 
  stem. 
  X 
  f. 
  

   2a 
  and 
  3a. 
  Joint-faces 
  of 
  the 
  -same 
  specimens, 
  slightly 
  frayed 
  at 
  the 
  

   periphery, 
  having 
  about 
  56 
  striae, 
  which 
  extend 
  inward 
  for 
  

   about 
  two-tilths 
  of 
  the 
  diameter 
  to 
  a 
  smooth 
  inner 
  ring 
  sur- 
  

   rounding 
  the 
  lumen. 
  X 
  f. 
  Collection 
  United 
  States 
  Na- 
  

   tional 
  Museum. 
  (Jpper 
  Jurassic, 
  Isthmus 
  of 
  Tehuantepee, 
  

   Mexico. 
  

  

  APIOCRINUS 
  ELEGANS 
  (Defrntice) 
  

  

  Upper 
  Jurassic, 
  Bathonien. 
  Calvados, 
  France 
  

  

  Figs. 
  4. 
  4b, 
  4c. 
  Joint-faces 
  and 
  lateral 
  view 
  of 
  isolated 
  stem 
  fragments, 
  show- 
  

   ing 
  t 
  lie 
  radiating 
  striae, 
  and 
  smooth 
  sunken 
  inner 
  ring. 
  After 
  

   De 
  Loriol, 
  Pa!. 
  France, 
  vol. 
  11, 
  pt. 
  1, 
  pi. 
  35, 
  figs, 
  4, 
  4b, 
  4c. 
  

   Natural 
  size. 
  

   5.0,7. 
  Different 
  forms 
  of 
  calyx 
  and 
  conical 
  stem 
  enlargement. 
  After 
  

   De 
  Loriol, 
  pi. 
  34, 
  figs. 
  1, 
  4, 
  6. 
  Natural 
  size. 
  

  

  PENTACRINUS 
  SUBANGULARIS, 
  var. 
  ALASKA 
  Springer 
  

  

  Lower 
  Jurassic. 
  Northern 
  Alaska 
  

  

  Figs. 
  8, 
  9. 
  Two 
  joint-faces, 
  showing 
  petaloid 
  sectors 
  with 
  creneliae 
  at 
  their 
  

   margin. 
  Natural 
  size. 
  Collection 
  United 
  States 
  National 
  

   Museum. 
  

  

  BALANOCRINUS 
  MEXICANUS 
  Springer 
  

  

  Upper 
  Cretaceous. 
  Tamaulipas, 
  Mexico 
  

  

  Fig. 
  10. 
  A 
  joint-face, 
  showing 
  petaloid 
  sectors 
  with 
  creneliae 
  at 
  periphery 
  of 
  

   the 
  joint. 
  X 
  f, 
  Collection 
  United 
  States 
  National 
  Museum. 
  

  

  BALANOCRINUS 
  HAITIENSIS 
  Springer 
  

  

  Tertiary, 
  Miocene. 
  Republic 
  of 
  Haiti 
  

  

  Fig. 
  11. 
  A 
  joint-face, 
  showing 
  petaloid 
  sectors, 
  with 
  shorter 
  peripheral 
  

   creneliae. 
  X 
  2. 
  Collection 
  United 
  States 
  National 
  Museum. 
  

  

  5 
  

  

  o 
  

  

  