﻿284 
  

  

  THE 
  EXTINCT 
  VERTEBRATE 
  ANIMALS 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATES. 
  

  

  PLATE 
  L 
  

  

  Pterichthys 
  Milleri, 
  Agassiz 
  ; 
  restored. 
  

   Fig. 
  1. 
  Dorsal 
  surface. 
  Fig. 
  2. 
  Ventral 
  surface. 
  Fig. 
  3. 
  Lateral 
  view. 
  

  

  PLATE 
  II. 
  

  

  Fig. 
  1. 
  Diplacanthus 
  striatus, 
  Agassiz 
  ; 
  restored. 
  

  

  Fig. 
  2. 
  Cheiracanthus 
  Murchisoni, 
  Agassiz 
  ; 
  restored. 
  

  

  Fig. 
  3. 
  Dipterus 
  Valenciennesiij 
  Sedgw. 
  and 
  Murch. 
  ; 
  restored. 
  

  

  Fig. 
  4. 
  Holoptychius 
  Flemingii, 
  Agassiz 
  ; 
  restored. 
  

  

  PLATE 
  in. 
  

  

  Fig. 
  1. 
  Gyroptychius 
  microlepidotus 
  (Agassiz) 
  ; 
  restored. 
  

   Fig. 
  2. 
  Osteolepis 
  macrolepidota, 
  Agassiz 
  ; 
  restored. 
  

   Fig. 
  3. 
  Diplopterus 
  Agassizii, 
  Traill 
  ; 
  restored. 
  

   Fig. 
  4. 
  Gieirolepis 
  Trailli, 
  Agassiz 
  ; 
  restored. 
  

  

  PLATE 
  IV. 
  

  

  Fig. 
  1. 
  Coccosteus 
  decipiens, 
  Agassiz 
  ; 
  restoration 
  of 
  skeleton. 
  

   Fig. 
  2. 
  Homosteus 
  Milleri, 
  Traquair 
  ; 
  restoration 
  of 
  cranial 
  buckler 
  and 
  dorsal 
  

   plates. 
  

  

  PLATE 
  V. 
  

  

  Asterolejris 
  maxima 
  (Agassiz) 
  ; 
  restored. 
  

   Fig. 
  1. 
  Dorsal 
  surface. 
  Fig. 
  2. 
  Ventral 
  surface. 
  

  

  PLATE 
  VI. 
  

  

  Fig. 
  1. 
  Psammosteus 
  Taylori, 
  Traquair 
  ; 
  shield, 
  rather 
  less 
  than 
  one-half 
  

   natural 
  size. 
  From 
  Newton 
  Quarry, 
  in 
  the 
  Edinburgh 
  Museum. 
  

  

  Fig. 
  2. 
  Stellate 
  ornament 
  of 
  the 
  outer 
  surface, 
  magnified. 
  Newton 
  

  

  Quarry. 
  

  

  Fig. 
  3. 
  Outer 
  surface 
  of 
  the 
  middle 
  layer 
  in 
  a 
  specimen, 
  from 
  which 
  

  

  the 
  outer 
  layer 
  has 
  disappeared. 
  Natural 
  size, 
  showing 
  the 
  honeycomb 
  

   markings 
  often 
  seen 
  in 
  such 
  cases. 
  Newton 
  Quarry. 
  

  

  Fig. 
  4. 
  Portion 
  of 
  a 
  Psammosteus 
  spine, 
  from 
  Scaat 
  Craig, 
  in 
  the 
  collection 
  of 
  Mr. 
  

   J. 
  Grant 
  of 
  Lossiemouth. 
  Natural 
  size. 
  

  

  Fig. 
  5. 
  Portion 
  of 
  the 
  same 
  spine 
  magnified 
  two 
  diameters. 
  

  

  