﻿EUGNATHIDJE. 
  343 
  

  

  fulcra 
  in 
  front 
  of 
  the 
  dorsal 
  fin; 
  and 
  the 
  form 
  of 
  the 
  

   trunk 
  is 
  evidently 
  somewhat 
  deepened 
  by 
  crushing. 
  

  

  Egerton 
  Coll. 
  

  

  41856. 
  A 
  small 
  fish, 
  0-24 
  in 
  length, 
  showing 
  the 
  characteristic 
  

   ornamentation 
  of 
  the 
  scales, 
  with 
  imperfect 
  head 
  and 
  

   wanting 
  the 
  greater 
  part 
  of 
  the 
  caudal 
  fin 
  ; 
  Lyme 
  Regis. 
  

   Relatively 
  large 
  teeth 
  are 
  shown 
  in 
  the 
  upper 
  jaw. 
  The 
  

   neural 
  and 
  haemal 
  arches 
  of 
  the 
  axial 
  skeleton 
  of 
  the 
  

   trunk 
  are 
  well 
  calcified, 
  but 
  there 
  are 
  no 
  distinct 
  indica- 
  

   tions 
  of 
  skeletal 
  elements 
  in 
  the 
  notochordal 
  sheath. 
  

   Large 
  fulcra 
  are 
  shown 
  on 
  the 
  upper 
  lobe 
  of 
  the 
  caudal, 
  

   but 
  the 
  other 
  tins 
  are 
  too 
  imperfectly 
  preserved 
  to 
  show 
  

   whether 
  similar 
  fulcra 
  were 
  present 
  or 
  absent. 
  The 
  

   ornamentation 
  of 
  the 
  scales 
  is 
  very 
  conspicuous 
  in 
  the 
  

   abdominal 
  region 
  : 
  there 
  are 
  stouter 
  rhombic 
  scales 
  on 
  

   the 
  atrophied 
  upper 
  caudal 
  lobe, 
  and 
  two 
  stout 
  median 
  

   scales 
  occur 
  at 
  the 
  base 
  of 
  the 
  lower 
  lobe 
  of 
  the 
  caudal 
  

   fin. 
  Purchased, 
  1870. 
  

  

  Caturus 
  insignis 
  (Kner). 
  

  

  1866. 
  Eugnathus 
  insignis, 
  R. 
  Kner, 
  Sitzungsb. 
  k. 
  Akad. 
  Wiss., 
  math.- 
  

   naturw. 
  01. 
  vol. 
  liv. 
  pt. 
  i. 
  p. 
  306, 
  pi. 
  i. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Innsbruck 
  Museum. 
  

  

  A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0'4. 
  Length 
  of 
  head 
  with 
  

   opercular 
  apparatus 
  about 
  equal 
  to 
  the 
  maximum 
  depth 
  of 
  the 
  

   trunk 
  and 
  contained 
  nearly 
  four-and-a-half 
  times 
  in 
  the 
  total 
  length 
  

   of 
  the 
  fish 
  ; 
  depth 
  of 
  caudal 
  pedicle 
  equalling 
  about 
  half 
  the 
  

   maximum 
  depth 
  of 
  the 
  trunk. 
  External 
  bones 
  ornamented 
  with 
  

   fine 
  granulations 
  and 
  rugae 
  ; 
  mandibular 
  teeth 
  robust 
  and 
  in 
  part 
  

   striated 
  ; 
  operculum 
  twice 
  as 
  deep 
  as 
  broad. 
  Pelvic 
  fins 
  arising 
  

   immediately 
  in 
  advance 
  of 
  the 
  dorsal, 
  which 
  arises 
  at 
  about 
  the 
  

   middle 
  poiut 
  of 
  the 
  back 
  and 
  comprises 
  17 
  rays 
  ; 
  anal 
  fin 
  with 
  

   11 
  rays, 
  smaller 
  than 
  the 
  dorsal, 
  and 
  arising 
  opposite 
  the 
  hinder 
  

   extremity 
  of 
  the 
  latter. 
  

  

  Form. 
  <Sf 
  Loc. 
  Upper 
  Trias 
  : 
  Seefeld, 
  Tyrol. 
  

  

  Not 
  represented 
  in 
  the 
  Collection. 
  

  

  The 
  following 
  species, 
  known 
  only 
  from 
  imperfect 
  specimens, 
  

   are 
  remarkable 
  for 
  the 
  large 
  size 
  and 
  robust 
  proportions 
  of 
  their 
  

   teeth. 
  They 
  are 
  commonly 
  described 
  as 
  Conodus, 
  Strobilodus, 
  TliJat- 
  

   todus, 
  and 
  Ditaociodus, 
  but 
  have 
  as 
  yet 
  exhibited 
  no 
  characters 
  by 
  

   which 
  they 
  can 
  be 
  distinguished 
  from 
  Caturus. 
  

  

  