﻿PLATE 
  III. 
  

  

  Fig. 
  Page 
  

  

  1. 
  Tetragonolepis 
  semicinctus, 
  Bronn 
  ; 
  left 
  lateral 
  aspect. 
  — 
  

  

  Upper 
  Lias 
  ; 
  Boll. 
  [P. 
  3625 
  b.] 
  160 
  

  

  2. 
  Ophiopsis 
  attenuata, 
  Wagner 
  ; 
  right 
  lateral 
  aspect. 
  — 
  Lower 
  

  

  Kimmeridgian 
  ; 
  Kelheim. 
  [P. 
  3609.] 
  167 
  

  

  3. 
  Ditto; 
  left 
  pectoral 
  fin, 
  onter 
  aspect, 
  thrice 
  nat. 
  size. 
  — 
  

  

  Ibid. 
  x. 
  Scale, 
  b. 
  Basal 
  cartilages. 
  [P. 
  1090.] 
  167 
  

  

  4. 
  Macrosemius 
  rostratus, 
  Agassiz 
  ; 
  right 
  lateral 
  aspect. 
  — 
  

  

  Lower 
  Kimmeridgian 
  ; 
  Eichstadt. 
  [P. 
  7177.] 
  178 
  

  

  5. 
  Proplerus 
  speciosus, 
  Wagner 
  ; 
  right 
  lateral 
  aspect. 
  — 
  Lower 
  

  

  Kimmeridgian; 
  Solenhofen. 
  [37088.] 
  184 
  

  

  6. 
  Propterus 
  scacchii 
  (Costa) 
  ; 
  left 
  lateral 
  aspect. 
  — 
  Upper 
  

  

  Jurassic 
  ; 
  Torre 
  d'Orlando. 
  [P. 
  3613.] 
  185 
  

  

  7. 
  jSotayogus 
  pentlandi, 
  Agassiz 
  ; 
  left 
  lateral 
  aspect. 
  — 
  Ibid. 
  

  

  [P. 
  2065.] 
  187 
  

  

  8. 
  Ditto 
  ; 
  portion 
  of 
  vertebral 
  axis, 
  middle 
  of 
  trunk 
  of 
  young 
  

  

  individual, 
  lateral 
  aspect, 
  one-third 
  nat. 
  size, 
  showing 
  

   pleurocentra 
  and 
  hypocentra. 
  — 
  Ibid. 
  [P. 
  1097.] 
  187 
  

  

  

  