﻿PLATE 
  XYI. 
  

  

  Fig. 
  Page 
  

  

  1. 
  Mesodon 
  rnacropterus 
  (Agassiz) 
  ; 
  left 
  lateral 
  aspect, 
  two- 
  

  

  thirds 
  nat. 
  size. 
  — 
  Lower 
  Kimmeridgian 
  ; 
  Eichstadt. 
  

   o. 
  Pectoral 
  basals. 
  fr. 
  Frontal, 
  o. 
  Orbit, 
  op. 
  Oper- 
  

   culum, 
  p 
  op. 
  Preoperculum. 
  pa. 
  Parietal. 
  s.occ. 
  

   Supraoccipital. 
  sq. 
  Squamosal, 
  v. 
  Vomer, 
  x. 
  Process 
  

   of 
  parietal. 
  [P. 
  5546.] 
  200 
  

  

  2. 
  Oyrodus 
  frontatus, 
  Agassiz 
  ; 
  lateral 
  aspect. 
  — 
  Lower 
  Kim- 
  

  

  meridgian 
  ; 
  Kelheim. 
  br. 
  Branchiostegal 
  rays. 
  cl. 
  

   Clavicle, 
  fr. 
  Frontal, 
  g.f. 
  Gill-filaments, 
  h. 
  Haemal 
  

   spines, 
  n. 
  Neural 
  spines, 
  op. 
  Operculum, 
  p. 
  Lobe 
  

   of 
  pectoral 
  fin. 
  p.op. 
  Preoperculum. 
  ph. 
  Pelvic 
  fin- 
  

   support, 
  scl. 
  Sclerotic, 
  sq. 
  Squamosal, 
  t. 
  Tesseros. 
  

   x. 
  Problematical 
  post-abdominal 
  bone. 
  [P. 
  2097.] 
  236 
  

  

  3. 
  Gyrodus 
  Tiexagonus 
  (Blainville) 
  ; 
  fragment 
  of 
  right 
  side 
  

  

  showing 
  Hyomandibular 
  (hm.), 
  Operculum 
  (op.), 
  and 
  

   Preoperculum 
  (p.op.). 
  — 
  Lower 
  Kimmeridgian 
  ; 
  Solen- 
  

   hofen. 
  [37108.] 
  235 
  

  

  4. 
  Coccodus 
  armatus, 
  Pictet 
  ; 
  cranium, 
  right 
  lateral 
  aspect. 
  — 
  

  

  Upper 
  Cretaceous 
  ; 
  Hakel. 
  [39227.] 
  268 
  

  

  