﻿PYGNODOinmX. 
  

  

  235 
  

  

  region, 
  and 
  in 
  the 
  simpler 
  mammillation 
  of 
  the 
  teeth. 
  The 
  maxi- 
  

   mum 
  depth 
  of 
  the 
  trunk 
  exceeds 
  its 
  length. 
  

  

  A 
  relatively 
  large 
  specimen 
  from 
  the 
  Lithographic 
  Stone 
  of 
  

   Solenhofen, 
  in 
  the 
  Munich 
  Museum, 
  is 
  regarded 
  by 
  Wagner 
  (Joe. 
  cit. 
  

   1862, 
  p. 
  335) 
  as 
  probably 
  a 
  distorted 
  example 
  of 
  this 
  species, 
  but 
  in 
  

   case 
  it 
  happens 
  to 
  prove 
  distinct 
  is 
  provisionally 
  named 
  G. 
  turgidus. 
  

  

  Form. 
  6f 
  Log. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone): 
  Bavaria. 
  

  

  P. 
  3774. 
  fragment 
  figured 
  by 
  Agassiz, 
  loc. 
  cit. 
  pi. 
  Ixix. 
  c. 
  fig. 
  4, 
  as 
  

   one 
  of 
  the 
  type 
  specimens 
  ; 
  Solenhofen. 
  Part 
  of 
  a 
  

   pectoral 
  fin 
  shows 
  seven 
  basals, 
  and 
  this 
  is 
  evidently 
  not 
  

   the 
  complete 
  series. 
  A 
  calcified 
  gill-filament 
  exhibits 
  the 
  

   sparse 
  denticles 
  on 
  one 
  side 
  as 
  in 
  Mesturus. 
  

  

  Ennishillen 
  Coll. 
  

  

  37108. 
  Xearly 
  complete 
  fish, 
  partly 
  crushed 
  and 
  fractured, 
  but 
  

   displaying 
  the 
  relations 
  of 
  the 
  hyomandibular 
  (Jim.) 
  to 
  the 
  

   operculum 
  (op.) 
  and 
  preoperculum 
  (p.ojo.) 
  as 
  shown 
  in 
  

   PI. 
  XYI. 
  fig. 
  3 
  ; 
  Solenhofen. 
  Haberlein 
  Coll. 
  

  

  37813. 
  Smaller 
  nearly 
  complete 
  fish, 
  in 
  counterpart 
  ; 
  Solenhofen. 
  

  

  Haberlein 
  Coll. 
  

  

  37814. 
  A 
  more 
  imperfect 
  specimen 
  0*175 
  in 
  length, 
  in 
  counter- 
  

  

  part 
  ; 
  Solenhofen. 
  A 
  detached 
  tooth 
  resembles 
  the 
  form 
  

   described 
  by 
  Agassiz 
  in 
  G. 
  macro 
  phthalmus. 
  

  

  Haberlein 
  Coll. 
  

  

  37106. 
  Imperfect 
  fish 
  0*14 
  in 
  length, 
  in 
  counterpart; 
  Solenhofen. 
  

  

  Haberlein 
  Coll. 
  

  

  P. 
  1623, 
  P. 
  1623 
  a, 
  P. 
  2098. 
  Two 
  imperfect 
  small 
  specimens 
  and 
  

   the 
  scattered 
  remains 
  of 
  a 
  larger 
  fish 
  ; 
  Solenhofen. 
  No. 
  

   P. 
  1623 
  shows 
  the 
  feebly 
  serrated 
  abdominal 
  ridge-scales, 
  

   and 
  no. 
  P. 
  2098 
  displays 
  the 
  splenial 
  dentition. 
  

  

  Egerton 
  Coll. 
  

  

  P. 
  3769, 
  P. 
  3772-73. 
  Four 
  imperfect 
  examples 
  of 
  the 
  trunk; 
  

   Kelheim. 
  Ennishillen 
  Coll. 
  

  

  Gyrodus 
  frontatus, 
  Agassiz. 
  

   [Plate 
  XYI. 
  fig. 
  2.] 
  

  

  1839-44. 
  Gyrodus 
  frontatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  ii. 
  

  

  pp. 
  226, 
  301, 
  pi. 
  lxviii. 
  

   1840. 
  Gyrodus 
  gracilis, 
  G. 
  von 
  Minister, 
  Beitr. 
  Petrefakt. 
  pt. 
  iii. 
  p. 
  128, 
  

  

  pi. 
  viii. 
  fig. 
  2. 
  [Immature 
  fish 
  ; 
  Palaeontological 
  Museum, 
  Munich, 
  

  

  and 
  Woodwardian 
  Museum, 
  Cambridge.] 
  

  

  