﻿PLATE 
  XXVI. 
  

  

  Rhyxchoxella 
  xeglecta 
  Hall. 
  

  

  Page 
  162. 
  

  

  Tigs. 
  1, 
  2. 
  Dorsal 
  and 
  front 
  views 
  of 
  a 
  specimen 
  of 
  the 
  usual 
  size. 
  

   Figs. 
  3-6. 
  Dorsal, 
  ventral, 
  lateral 
  and 
  front 
  views 
  of 
  a 
  larger 
  specimen. 
  

  

  Rhyxchoxella 
  acixus 
  Hall. 
  

  

  Page 
  163. 
  

  

  Fig. 
  7. 
  The 
  dorsal 
  side 
  of 
  a 
  specimen 
  of 
  regularly 
  ovate 
  form, 
  enlarged 
  to 
  four 
  

  

  diameters. 
  

   Figs. 
  8-11. 
  Dorsal, 
  front, 
  ventral 
  and 
  lateral 
  views 
  of 
  a 
  somewhat 
  larger 
  speci- 
  

   men, 
  similarly 
  enlarged, 
  showing 
  the 
  usual 
  features 
  of 
  the 
  species. 
  

  

  Rhyxchoxella 
  Ixdiaxexsis 
  Hall. 
  

  

  Page 
  163. 
  

  

  Fig. 
  12. 
  Dorsal 
  view 
  of 
  a 
  small 
  specimen. 
  

  

  Figs. 
  13, 
  14. 
  Dorsal 
  and 
  ventral 
  views 
  of 
  a 
  larger 
  specimen, 
  having 
  three 
  plica- 
  

   tions 
  elevated 
  on 
  the 
  dorsal 
  fold. 
  

  

  Figs. 
  15, 
  16. 
  Corresponding 
  views 
  of 
  a 
  specimen 
  with 
  four 
  plications 
  elevated 
  

   on 
  the 
  dorsal 
  fold. 
  

  

  Figs. 
  17, 
  18. 
  The 
  dorsal 
  aud 
  ventral 
  sides 
  of 
  a 
  smaller 
  specimen, 
  having 
  four 
  

   plications 
  on 
  the 
  fold. 
  

  

  Fig. 
  19. 
  Lateral 
  view 
  of 
  the 
  specimen 
  fig. 
  15. 
  

  

  Fig. 
  20. 
  Lateral 
  view 
  of 
  the 
  specimen 
  fig. 
  17. 
  

  

  Figs. 
  21, 
  22. 
  Front 
  views 
  of 
  the 
  specimens 
  figs. 
  15 
  and 
  17. 
  

  

  . 
  

  

  Rhyxchoxella 
  AVhitii 
  Hall. 
  

  

  Page 
  164. 
  

  

  Figs. 
  23-26. 
  Dorsal, 
  ventral, 
  front 
  and 
  lateral 
  views 
  of 
  a 
  characteristic 
  specimen 
  

  

  of 
  this 
  species, 
  having 
  but 
  two 
  plications 
  elevated 
  in 
  the 
  center. 
  

   Figs. 
  27-29. 
  Dorsal, 
  ventral 
  and 
  front 
  views 
  of 
  a 
  specimen 
  with 
  one 
  of 
  the 
  

   median 
  plications 
  divided, 
  making 
  three 
  elevated 
  on 
  the 
  mesial 
  

   fold. 
  

   Figs. 
  30-33. 
  Front, 
  lateral, 
  dorsal 
  and 
  ventral 
  views 
  of 
  a 
  specimen, 
  showing 
  

   four 
  elevated 
  plications 
  on 
  the 
  mesial 
  fold. 
  

  

  . 
  

   Rhyxchoxella 
  Stricklaxdi 
  (Sowerby). 
  

  

  Pao-e 
  165 
  

  

  Figs. 
  34, 
  35. 
  Dorsal 
  and 
  ventral 
  views 
  of 
  a 
  specimen 
  of 
  the 
  more 
  finely 
  plicated 
  

  

  variety. 
  

   Fig. 
  36. 
  Dorsal 
  view 
  of 
  a 
  specimen 
  with 
  coarser 
  plications. 
  

   Fig. 
  37. 
  Lateral 
  view 
  of 
  the 
  specimen 
  fig. 
  34. 
  

   Fig. 
  38. 
  Front 
  view 
  of 
  the 
  preceding, 
  showing 
  the 
  narrower 
  form 
  of 
  the 
  mesial 
  

  

  elevation. 
  

  

  