﻿128 
  Mr. 
  C. 
  T. 
  Regan 
  on 
  the 
  Anatomy 
  and 
  

  

  The 
  new 
  genus 
  Parasudis, 
  here 
  established 
  for 
  Chloro- 
  

   phthalmus 
  truculentus, 
  Goode 
  & 
  Bean, 
  differs 
  from 
  Chloro- 
  

   phthalmus 
  in 
  that 
  the 
  snout 
  is 
  produced 
  so 
  that 
  the 
  maxillary 
  

   does 
  not 
  reach 
  the 
  eye, 
  whilst 
  the 
  body 
  is 
  more 
  compressed 
  

   and 
  the 
  vent 
  is 
  placed 
  further 
  back. 
  It 
  is 
  clearly 
  annectant 
  

   between 
  Chlorophthalmus 
  and 
  Paralepis 
  and 
  invalidates 
  the 
  

   claim 
  of 
  the 
  latter 
  to 
  rank 
  as 
  the 
  type 
  of 
  a 
  separate 
  family. 
  

   I 
  find 
  that 
  in 
  Paralepis 
  and 
  Sudis 
  the 
  mouth 
  structure 
  is 
  very 
  

   similar 
  to 
  that 
  of 
  Chlorophthalmus 
  ; 
  the 
  maxillary 
  is 
  more 
  

   slender 
  and 
  more 
  adherent 
  to 
  the 
  prsemaxillary, 
  but 
  it 
  is 
  

   somewhat 
  dilated 
  distally 
  and 
  bears 
  a 
  long 
  supramaxillary 
  

   just 
  as 
  in 
  Chlorophthalmus. 
  

  

  Family 
  4. 
  Myctophidse. 
  

  

  Closely 
  related 
  to 
  the 
  Sudidae, 
  from 
  which 
  they 
  differ 
  

   especially 
  in 
  that 
  (1) 
  a 
  median 
  keel 
  is 
  present 
  on 
  the 
  ethmoid, 
  

   and 
  (2) 
  the 
  parasphenoid 
  extends 
  upwards 
  to 
  the 
  frontals 
  

   between 
  the 
  lateral 
  ethmoids. 
  As 
  in 
  the 
  Sudidse, 
  the 
  vomerine 
  

   teeth, 
  when 
  present, 
  form 
  two 
  well-separated 
  patches. 
  The 
  

   body 
  is 
  oblong, 
  compressed 
  ; 
  the 
  head 
  is 
  compressed, 
  with 
  

   the 
  eyes 
  lateral 
  and 
  the 
  mouth 
  terminal. 
  In 
  the 
  more 
  primi- 
  

   tive 
  genera 
  the 
  mouth 
  is 
  formed 
  as 
  in 
  Chlorophthalmus 
  , 
  with 
  

   the 
  maxillary 
  strongly 
  expanded 
  behind 
  and 
  bearing 
  a 
  supra- 
  

   maxillary; 
  but 
  in 
  the 
  more 
  specialized 
  forms 
  thesuspensorium 
  

   is 
  directed 
  obliquely 
  backwards 
  and 
  the 
  slender 
  maxillary 
  is 
  

   adherent 
  to 
  the 
  prsemaxillary, 
  almost 
  as 
  in 
  the 
  Synodontidse. 
  

   In 
  Scopelengys, 
  Alcock, 
  there 
  are 
  no 
  photophores. 
  Neo- 
  

   scopelus, 
  Johnson, 
  has 
  a 
  luminous 
  spot 
  on 
  each 
  scale 
  of 
  the 
  

   lower 
  part 
  of 
  the 
  body, 
  whilst 
  in 
  Scopelopsis, 
  Brauer, 
  every 
  

   scale 
  bears 
  a 
  spot. 
  In 
  Myctophum 
  and 
  its 
  allies 
  the 
  photo- 
  

   phores 
  are 
  arranged 
  in 
  definite 
  groups 
  and 
  series. 
  This 
  is 
  

   apparently 
  the 
  only 
  family 
  of 
  the 
  order 
  in 
  which 
  an 
  air- 
  

   bladder 
  may 
  sometimes 
  be 
  present. 
  

  

  Neoscopelus 
  is 
  a 
  very 
  generalized 
  Myctophid 
  ; 
  the 
  bones 
  

   are 
  thin, 
  and 
  the 
  skull 
  is 
  less 
  expanded 
  behind 
  the 
  orbits 
  and 
  

   has 
  the 
  sphenotic 
  process 
  less 
  prominent 
  than 
  in 
  Aulopus. 
  

   The 
  parietals 
  are 
  separated 
  by 
  the 
  supraoccipital, 
  the 
  posterior 
  

   temporal 
  fossse 
  are 
  not 
  roofed, 
  there 
  is 
  no 
  orbitosphenoid, 
  and 
  

   the 
  parasphenoid 
  is 
  slender. 
  As 
  already 
  indicated, 
  the 
  latter 
  

   bone 
  meets 
  the 
  frontals 
  just 
  behind 
  their 
  junction 
  with 
  the 
  

  

  C. 
  Lower 
  part 
  of 
  pectoral 
  of 
  12 
  to 
  14 
  rays. 
  

   Outermost 
  pelvic 
  ray 
  not 
  or 
  scarcely 
  produced 
  . 
  . 
  longifilis, 
  Giinth. 
  

  

  Outermost 
  pelvic 
  ray 
  moderately 
  produced 
  .... 
  j 
  fJ^laVmn, 
  Akock. 
  

   Outermost 
  pelvic 
  ray 
  considerably 
  produced 
  .... 
  ventralis, 
  Garni. 
  

  

  