﻿MACROSEMIID.E. 
  187 
  

  

  Length 
  of 
  head 
  with 
  opercular 
  apparatus 
  considerably 
  exceeding 
  

   the 
  maximum 
  depth 
  of 
  the 
  trunk 
  and 
  equalling 
  half 
  its 
  length 
  to 
  

   the 
  base 
  of 
  the 
  caudal 
  fin 
  ; 
  width 
  of 
  caudal 
  pedicle 
  somewhat 
  less 
  

   than 
  half 
  the 
  maximum 
  depth 
  of 
  the 
  trunk, 
  which 
  tapers 
  gradually 
  

   from 
  a 
  point 
  close 
  to 
  the 
  occiput. 
  Dorsal 
  fin 
  arising 
  at 
  the 
  end 
  of 
  

   the 
  first 
  quarter 
  of 
  the 
  back, 
  and 
  its 
  anterior 
  portion 
  twice 
  as 
  much 
  

   extended 
  as 
  the 
  hinder 
  portion 
  ; 
  the 
  first 
  comprising 
  about 
  14 
  rays, 
  

   very 
  widely 
  spaced 
  and 
  all 
  shorter 
  than 
  those 
  of 
  the 
  second 
  portion, 
  

   which 
  are 
  more 
  closely 
  arranged 
  and 
  only 
  10 
  in 
  number. 
  Anal 
  fin, 
  

   with 
  large 
  fulcra 
  and 
  about 
  6 
  rays, 
  as 
  deep 
  as 
  the 
  second 
  portion 
  

   of 
  the 
  dorsal 
  and 
  arising 
  slightly 
  behind 
  the 
  origin 
  of 
  the 
  latter. 
  

   Scales 
  very 
  finely 
  crenulated. 
  

  

  This 
  is 
  commonly 
  regarded 
  as 
  the 
  type 
  species 
  of 
  Notagogus. 
  

  

  Form. 
  Sf 
  Loc. 
  Upper 
  Jurassic 
  : 
  Naples. 
  

  

  117. 
  Type 
  specimen 
  ; 
  Torre 
  d'Orlando, 
  near 
  Castellamare. 
  

  

  Purchased, 
  1837. 
  

  

  P. 
  2065. 
  Finer 
  specimen 
  0*14 
  in 
  length, 
  shown 
  of 
  the 
  natural 
  size 
  

   in 
  PL 
  III. 
  fig. 
  7; 
  Torre 
  d'Orlando. 
  Egerton 
  Coll. 
  

  

  P. 
  6866. 
  Impression 
  of 
  a 
  large 
  fish 
  distorted 
  at 
  the 
  lower 
  margin 
  

   of 
  the 
  abdominal 
  region, 
  apparently 
  the 
  counterpart 
  of 
  

   the 
  type 
  specimen 
  of 
  the 
  so-called 
  N. 
  latior 
  ; 
  Torre 
  

   d'Orlando. 
  Presented 
  by 
  Walter 
  Crouch, 
  Esq., 
  1893. 
  

  

  P. 
  1097. 
  Three 
  imperfect 
  young 
  specimens, 
  the 
  largest 
  about 
  0*06 
  

   in 
  length, 
  exhibiting 
  the 
  internal 
  skeleton 
  of 
  the 
  trunk 
  ; 
  

   Torre 
  d'Orlando. 
  The 
  middle 
  portion 
  of 
  the 
  vertebral 
  

   axis 
  of 
  one 
  specimen 
  is 
  shown 
  of 
  three 
  times 
  the 
  natural 
  

   size 
  in 
  PL 
  III. 
  fig. 
  8. 
  The 
  pleurocentra 
  and 
  hypocentra 
  

   are 
  observed 
  to 
  be 
  distinct 
  posteriorly, 
  but 
  soon 
  fused 
  

   together 
  in 
  the 
  abdominal 
  region. 
  Egerton 
  Coll. 
  

  

  Notagogus 
  denticulatus, 
  Agassiz. 
  

  

  1844. 
  Notagogus 
  denticulatus, 
  L. 
  Agassiz, 
  Poiss. 
  Foss. 
  vol. 
  ii. 
  pt. 
  i. 
  

  

  p. 
  294, 
  pi. 
  1. 
  tigs. 
  1-5, 
  pt. 
  ii. 
  p. 
  289. 
  

   1851. 
  Notagogus 
  denticulatus, 
  A. 
  Wagner, 
  Abh. 
  k. 
  bay. 
  Akad. 
  Wiss., 
  

  

  math.-phys. 
  CI. 
  vol. 
  vi. 
  p. 
  65. 
  

   1863. 
  Propterus 
  denticulatus, 
  A. 
  Wagner, 
  ibid. 
  vol. 
  ix. 
  p. 
  646. 
  

   1881. 
  Notagogus 
  denticulatus, 
  B. 
  Vetter, 
  Mittheil. 
  k. 
  mineral.-geol. 
  

  

  Mus. 
  Dresden, 
  pt. 
  iv. 
  p. 
  43. 
  

  

  Type. 
  Nearly 
  complete 
  fish 
  ; 
  Palaeontological 
  Museum, 
  Munich. 
  

   A 
  species 
  attaining 
  a 
  length 
  of 
  about 
  0-1. 
  Proportions 
  of 
  head 
  

   and 
  trunk 
  as 
  in 
  N. 
  pentlandi, 
  except 
  that 
  the 
  trunk 
  in 
  the 
  abdo- 
  

  

  