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  EUGSTATHIDJ5. 
  333 
  

  

  1863. 
  Caturus 
  microchirus, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss. 
  

  

  math.-phys. 
  CI. 
  vol. 
  ix. 
  p. 
  703. 
  

   1863. 
  Caturus 
  macrurus, 
  A. 
  Wagner, 
  ibid. 
  p. 
  706. 
  

   1863. 
  Caturus 
  obovatus, 
  A. 
  Wagner, 
  ibid. 
  p. 
  707. 
  

   1863. 
  Caturus 
  gracilis, 
  A. 
  Wagner, 
  ibid. 
  p. 
  707. 
  [Variety 
  in 
  Palaeon- 
  

  

  tological 
  Museum, 
  Munich.] 
  

   1871. 
  Caturus 
  ferox, 
  T. 
  C. 
  Winkler, 
  Archiv. 
  Mus. 
  Teyler, 
  vol. 
  iii. 
  p. 
  176 
  

  

  pi. 
  v. 
  figs.' 
  2, 
  3. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Royal 
  Bohemian 
  Museum, 
  Prague. 
  

  

  The 
  type 
  species, 
  attaining 
  a 
  length 
  of 
  about 
  1 
  metre. 
  Length 
  

   of 
  head 
  with 
  opercular 
  apparatus 
  about 
  equal 
  to 
  the 
  maximum 
  

   depth 
  of 
  the 
  trunk, 
  and 
  usually 
  less 
  than 
  one-quarter 
  of 
  the 
  total 
  

   length 
  of 
  the 
  fish. 
  Caudal 
  region 
  tapering 
  to 
  a 
  comparatively 
  

   slender 
  pedicle, 
  its 
  depth 
  little, 
  if 
  at 
  all, 
  exceeding 
  one-third 
  the 
  

   maximum 
  depth 
  of 
  the 
  abdominal 
  region. 
  Teeth 
  large, 
  with 
  very 
  

   slender 
  apex, 
  and 
  about 
  40 
  in 
  total 
  number 
  in 
  the 
  dentary 
  ; 
  depth 
  

   of 
  operculum 
  somewhat 
  exceeding 
  its 
  maximum 
  breadth 
  ; 
  branchio- 
  

   stegal 
  rays 
  about 
  24. 
  Dorsal 
  fin 
  with 
  about 
  20 
  rays, 
  deeper 
  than 
  

   long, 
  its 
  depth 
  equalling 
  about 
  one-half 
  that 
  of 
  the 
  trunk 
  at 
  its 
  

   origin 
  ; 
  this 
  fin 
  arising 
  in 
  advance 
  of 
  the 
  middle 
  of 
  the 
  back, 
  the 
  

   distance 
  from 
  the 
  occiput 
  to 
  its 
  origin 
  being 
  equal 
  to 
  that 
  from 
  its 
  

   hinder 
  border 
  to 
  the 
  base 
  of 
  the 
  caudal 
  fin. 
  Pelvic 
  fins 
  arising 
  

   opposite 
  the 
  front 
  half 
  of 
  the 
  dorsal 
  fin 
  ; 
  anal 
  fin 
  smaller 
  than 
  the 
  

   dorsal, 
  with 
  from 
  12 
  to 
  14 
  rays. 
  Scales 
  smooth, 
  or 
  in 
  part 
  marked 
  

   with 
  a 
  few 
  feeble, 
  short, 
  transverse 
  striae. 
  

  

  Form. 
  Sf 
  Log. 
  Lower 
  Kimmeridgian 
  (Lithographic 
  Stone) 
  : 
  Bavaria, 
  

   and 
  (?) 
  Ain, 
  France. 
  

  

  37024, 
  37026. 
  Two 
  fine 
  specimens 
  nearly 
  0'5 
  in 
  length, 
  in 
  counter- 
  

   part 
  ; 
  Solenhofen. 
  The 
  vertebral 
  pleurocentra 
  and 
  hypo- 
  

   centra 
  are 
  well 
  developed, 
  and 
  the 
  first 
  specimen 
  exhibits 
  

   the 
  large 
  gular 
  plate 
  with 
  about 
  21 
  branchiostegal 
  rays. 
  

  

  Haberlein 
  Coll. 
  

  

  P. 
  3726. 
  Similar 
  specimen 
  ; 
  Solenhofen. 
  EnnisJcillen 
  Coll. 
  

  

  49141. 
  Plaster 
  cast 
  of 
  large 
  specimen 
  (Palaeontological 
  Museum, 
  

   Munich) 
  apparently 
  elongated 
  by 
  crushing; 
  Kelheim. 
  

  

  Purchased, 
  1878. 
  

  

  37028, 
  37034, 
  37038. 
  Three 
  specimens 
  from 
  0-36 
  to 
  0-42 
  in 
  length; 
  

   Solenhofen. 
  The 
  last 
  specimen 
  shows 
  the 
  atrophied 
  

   upper 
  caudal 
  lobe. 
  Haberlein 
  Coll. 
  

  

  37027. 
  Imperfect 
  fish 
  0-32 
  in 
  length, 
  in 
  counterpart, 
  with 
  indica- 
  

   tions 
  of 
  ossified 
  pleurocentra 
  and 
  hypocentra 
  ; 
  Solenhofeu. 
  

  

  