﻿PLATE 
  XXXIII. 
  

  

  Dalmanttes 
  vigilans 
  Hall. 
  

  

  Page 
  193. 
  

  

  Fig. 
  1. 
  The 
  upper 
  side 
  of 
  a 
  cephalic 
  shield, 
  showing 
  the 
  characters 
  observed 
  

  

  on 
  several 
  individuals 
  from 
  this 
  locality. 
  

   Fig. 
  2. 
  The 
  lower 
  surface 
  of 
  the 
  border 
  of 
  a 
  head. 
  

   Figs. 
  3, 
  4. 
  Two 
  pygidia 
  referred 
  to 
  the 
  same 
  species. 
  

  

  Dalmanttes 
  verrucosus 
  Hall. 
  

  

  Page 
  195. 
  

  

  Fig. 
  5. 
  A 
  small 
  head, 
  having 
  the 
  usual 
  character 
  of 
  this 
  species. 
  

  

  Fig. 
  6. 
  A 
  larger 
  head 
  showing 
  a 
  slight 
  spiniform 
  node 
  on 
  the 
  occipital 
  ring. 
  

  

  Fig. 
  7. 
  The 
  dorsal 
  surface 
  of 
  a 
  large 
  specimen, 
  preserving 
  the 
  head 
  and 
  thorax 
  

  

  entire, 
  and 
  the 
  anterior 
  part 
  of 
  the 
  pygidium, 
  with 
  all 
  their 
  

  

  characteristic 
  markings. 
  

   Fig. 
  8. 
  A 
  much 
  larger 
  imperfect 
  head. 
  

   Fig. 
  9. 
  Anterior 
  view 
  of 
  a 
  nearly 
  perfect 
  head, 
  of 
  somewhat 
  more 
  than 
  the 
  

  

  medium 
  size, 
  showing 
  the 
  anterior 
  extension 
  of 
  the 
  facial" 
  suture, 
  

  

  on 
  the 
  left 
  hand 
  side 
  of 
  the 
  figure. 
  

   Fig. 
  10. 
  Lateral 
  view 
  of 
  the 
  same, 
  showing 
  the 
  posterior 
  extension 
  of 
  the 
  

  

  facial 
  suture. 
  

   Fig. 
  11. 
  An 
  enlargement 
  of 
  the 
  eye. 
  

   Fig. 
  12. 
  A 
  profile 
  view 
  of 
  a 
  thoracic 
  segment. 
  

  

  Figs. 
  13-15. 
  The 
  pygidia 
  of 
  three 
  individuals, 
  showing 
  gradations 
  in 
  size. 
  

   Fig. 
  16. 
  Profile 
  of 
  the 
  specimen 
  fig. 
  15, 
  showing 
  the 
  elevation 
  of 
  the 
  axis. 
  

   Fig. 
  17. 
  A 
  larger 
  pygidium, 
  which 
  is 
  remarkably 
  straight 
  on 
  the 
  anterior 
  

  

  margin. 
  > 
  

  

  Dalmanites 
  bicornis 
  Hall. 
  

   Page 
  196. 
  

   Fig. 
  18. 
  The 
  lower 
  surface 
  of 
  the 
  marginal 
  rim 
  of 
  the 
  head, 
  showing 
  the 
  an- 
  

   terior 
  bifurcating 
  process. 
  No 
  other 
  parts 
  of 
  this 
  species 
  are 
  

   known 
  at 
  the 
  present 
  time. 
  

  

  