﻿PLATE 
  XXXII. 
  

  

  Lepeeditia 
  faba 
  Hall. 
  

  

  Page 
  186. 
  

  

  Pig. 
  1. 
  The 
  right 
  side 
  of 
  a 
  specimen 
  greatly 
  enlarged, 
  showing 
  the 
  line 
  of 
  the 
  

  

  hinge 
  and 
  the 
  projection 
  of 
  the 
  left 
  valve 
  above 
  the 
  right. 
  

   Fig. 
  2. 
  Basal 
  view 
  of 
  the 
  same 
  specimen, 
  showing 
  the 
  convexity 
  of 
  the 
  valves. 
  

   Fig. 
  3. 
  The 
  left 
  side 
  of 
  a 
  specimen, 
  showing 
  the 
  overlapping 
  of 
  the 
  valves 
  at 
  

   the 
  base 
  . 
  

  

  Beykichia 
  graxelosa 
  Hall. 
  

   Page 
  186. 
  

  

  Fig. 
  -i. 
  An 
  enlargement 
  of 
  a 
  right 
  valve 
  with 
  the 
  dorsal 
  margin 
  incomplete, 
  

   showing 
  the 
  general 
  form 
  and 
  granulose 
  surface. 
  The 
  granulae 
  as 
  

   represented 
  are 
  too 
  regularly 
  disposed. 
  

  

  Ctphaspis 
  Cheistyi 
  Hall. 
  

  

  Page 
  188. 
  

  

  Fig. 
  5. 
  A 
  separate 
  head, 
  imperfect 
  on 
  the 
  eye-tubercles 
  and 
  the 
  glabella; 
  

  

  enlarged 
  to 
  two 
  diameters 
  . 
  

   Fig. 
  6. 
  An 
  entire 
  individual, 
  enlarged 
  to 
  two 
  diameters. 
  

  

  Fig. 
  7. 
  Profile 
  of 
  the 
  same 
  specimen, 
  showing 
  the 
  elevation 
  of 
  the 
  body. 
  

   enlarged 
  to 
  correspond 
  with 
  the 
  preceding 
  figure 
  . 
  

  

  Calyaiexe 
  Xiagarexsis 
  Hall. 
  

   Page 
  187. 
  

  

  Fig. 
  8. 
  The 
  upper 
  surface 
  of 
  a 
  large 
  specimen, 
  slightly 
  distorted 
  about 
  the 
  

   cephalic 
  shield. 
  

  

  Fig. 
  9. 
  The 
  under 
  side 
  of 
  the 
  same, 
  showing 
  the 
  hypostoma 
  in 
  place. 
  

  

  Ficr. 
  10. 
  The 
  upper 
  surface 
  of 
  a 
  larger 
  cephalic 
  shield, 
  showing 
  nearly 
  perfect 
  

   eye-tubercles. 
  

  

  Figs. 
  11. 
  12. 
  Front 
  and 
  lower 
  side 
  of 
  the 
  same 
  specimen, 
  showing 
  the 
  continua- 
  

   tion 
  of 
  the 
  facial 
  sutures. 
  

  

  Fig. 
  13. 
  A 
  separated 
  glabella 
  and 
  fixed 
  cheeks. 
  

  

  Fig. 
  14. 
  Profile 
  of 
  the 
  specimen 
  fig. 
  11. 
  

  

  Ficr. 
  15. 
  Profile 
  of 
  the 
  specimen 
  fig. 
  13, 
  showing 
  the 
  line 
  of 
  the 
  facial 
  suture 
  

   and 
  elevation. 
  

  

  Ceraeres 
  (Chieeeees) 
  Niagarexsis 
  Hall. 
  

   Page 
  189. 
  

   Fig. 
  16. 
  A 
  nearly 
  entire 
  pygidium. 
  showing 
  its 
  form 
  and 
  characters. 
  

  

  Homaloxotes 
  delphlxocephales 
  (Green). 
  

   Page 
  187. 
  

   Fio-. 
  17. 
  The 
  upper 
  surface 
  of 
  a 
  fragment 
  of 
  a 
  head, 
  showing 
  the 
  characters 
  as 
  

   well 
  as 
  can 
  be 
  seen 
  in 
  any 
  of 
  the 
  specimens 
  known 
  from 
  this 
  locality. 
  

   Fig. 
  18. 
  An 
  imperfect 
  pygidium. 
  

  

  Ill^exes 
  armatus 
  ? 
  Hall. 
  

   Page 
  189. 
  

   Fig. 
  19. 
  An 
  imperfect 
  glabella. 
  

  

  Fig. 
  20. 
  An 
  imperfect 
  pygidium, 
  the 
  anterior 
  margin 
  restored 
  in 
  outline 
  at 
  the 
  

   right 
  hand 
  upper 
  angle 
  . 
  

  

  