﻿OF 
  THE 
  MORAY 
  FIRTH 
  AREA. 
  

  

  285 
  

  

  Fig. 
  6. 
  Portion 
  of 
  a 
  spine 
  of 
  Cosmacanthus 
  Malcolmsoiii, 
  Agassiz 
  ; 
  lateral 
  view 
  ; 
  

  

  natural 
  size. 
  Scaat 
  Craig. 
  

   Fig. 
  7. 
  The 
  same 
  spine, 
  external 
  view. 
  

  

  Fig. 
  8. 
  Outline 
  of 
  the 
  transverse 
  section 
  of 
  the 
  proximal 
  part 
  of 
  the 
  same 
  spine 
  ; 
  

  

  showing 
  want 
  of 
  bilateral 
  symmetry. 
  

   Fig. 
  9. 
  Outline 
  of 
  the 
  transverse 
  section 
  of 
  the 
  distal 
  portion 
  of 
  the 
  same 
  spine 
  ; 
  

  

  showing 
  internal 
  cavity, 
  and 
  want 
  of 
  bilateral 
  symmetry. 
  

   Fig. 
  10. 
  Anterior 
  median 
  ventral 
  plate 
  of 
  Coccosteus 
  magnus, 
  Traquair 
  ; 
  inner 
  

  

  surface, 
  natural 
  size. 
  Kingsteps, 
  Nairn. 
  

   Fig. 
  11. 
  Scale 
  of 
  Holoptychius 
  decoratus 
  (Eichwald) 
  ; 
  natural 
  size. 
  Kingsteps, 
  

  

  Nairn. 
  

  

  PLATE 
  VII. 
  

  

  Fig. 
  1. 
  Mandible 
  of 
  Polyplocodus 
  leptognathus, 
  Traquair 
  ; 
  natural 
  size. 
  King- 
  

   steps, 
  Nairn. 
  

  

  Fig. 
  2. 
  Palatopterygoid 
  bone 
  of 
  Polyplocodus 
  leptognathus, 
  Traquair 
  ; 
  natural 
  size. 
  

   Kingsteps, 
  Nairn. 
  

  

  PLATE 
  VIII. 
  

  

  Restored 
  outline 
  of 
  the 
  dorsal 
  surface 
  of 
  Bothriolepis 
  major 
  (Agassiz) 
  ; 
  surface 
  

   ornament 
  omitted. 
  

  

  PLATE 
  IX. 
  

  

  Bothriolepis 
  cristata, 
  Traquair; 
  natural 
  size. 
  From 
  Rosebrae. 
  In 
  the 
  Elgin 
  Museum. 
  

  

  Fig. 
  1. 
  Right 
  lateral 
  view, 
  a.m.d. 
  anterior 
  median 
  dorsal 
  plate 
  ; 
  p.m.d. 
  posterior 
  

   median 
  dorsal 
  ; 
  a.d.l. 
  anterior 
  dorso-lateral 
  ; 
  p.d.l. 
  posterior 
  dorso- 
  

   lateral 
  ; 
  a.v.l. 
  anterior 
  ventro-lateral 
  ; 
  p.v.l. 
  posterior 
  ventro-lateral 
  ; 
  

   br. 
  articulation 
  of 
  right 
  arm. 
  

  

  Fig. 
  2. 
  The 
  specimen 
  removed 
  from 
  the 
  matrix 
  ; 
  dorsal 
  view. 
  Lettering 
  as 
  

   above, 
  but 
  br. 
  here 
  shows 
  the 
  articulation 
  of 
  the 
  left 
  arm. 
  

  

  Fig. 
  3. 
  The 
  specimen 
  replaced 
  in 
  the 
  matrix, 
  which 
  shows 
  the 
  greater 
  part 
  of 
  the 
  

   left 
  arm. 
  a.v.l. 
  and 
  p.v.l. 
  anterior 
  and 
  posterior 
  ventro 
  lateral 
  plates 
  ; 
  

   s.l. 
  semilunar 
  ; 
  m.v. 
  median 
  ventral. 
  

  

  