﻿126 
  Mr. 
  C. 
  T. 
  Regan 
  on 
  the 
  Anatomy 
  and 
  

  

  to 
  the 
  vomer 
  is 
  ligamentous, 
  the 
  temporal 
  fossae 
  are 
  apparently 
  

   not 
  roofed, 
  the 
  upper 
  limbs 
  of 
  the 
  post-temporal 
  are 
  attached 
  

   by 
  ligament 
  to 
  the 
  epiotics, 
  but 
  nearly 
  meet 
  above 
  the 
  supra- 
  

   occipital, 
  and 
  the 
  pelvic 
  bones 
  are 
  simple 
  triangular 
  plates. 
  

   I 
  have 
  had 
  no 
  skeleton, 
  and 
  [ 
  have 
  ascertained 
  these 
  characters 
  

   from 
  examination 
  of 
  a 
  spirit-specimen. 
  The 
  coracoids 
  and 
  

   pectoral 
  radials 
  are 
  intermediate 
  between 
  those 
  of 
  Aulopus 
  or 
  

   Myctophum 
  and 
  Bathypterois. 
  The 
  hypocoracoid 
  is 
  narrowed 
  

   forward 
  below, 
  but 
  meets 
  the 
  cleithrum 
  far 
  above 
  the 
  sym- 
  

   physis, 
  and 
  the 
  radials 
  are 
  compressed, 
  but 
  not 
  greatly 
  enlarged. 
  

   The 
  circumorbital 
  and 
  nasal 
  bones 
  are 
  thin, 
  but 
  otherwise 
  

   as 
  in 
  Aulopus. 
  With 
  Chlorophthalmus 
  I 
  would 
  associate 
  

   a 
  number 
  of 
  genera 
  which 
  agree 
  with 
  it 
  in 
  the 
  following- 
  

   characters 
  at 
  least 
  : 
  — 
  

  

  Snout 
  obtusely 
  rounded 
  when 
  seen 
  from 
  above 
  ; 
  mouth 
  

   terminal, 
  with 
  the 
  lower 
  jaw 
  prominent 
  ; 
  maxillary 
  dilated 
  

   posteriorly, 
  with 
  a 
  single 
  suprarnaxillary 
  usually 
  present. 
  

   Pointed 
  teeth 
  forming 
  narrow 
  bands 
  or 
  a 
  single 
  series 
  in 
  the 
  

   jaws 
  and 
  usually 
  on 
  the 
  palatines 
  ; 
  vomerine 
  teeth, 
  when 
  

   present, 
  forming 
  two 
  well-separated 
  patches. 
  Dorsal 
  fin 
  

   short; 
  pectorals 
  lateral 
  ; 
  -pelvics 
  usually 
  not 
  widely 
  separated. 
  

   Skeleton 
  rather 
  weakly 
  ossified 
  ; 
  ethmoid 
  without 
  median 
  

   keel 
  ; 
  post-temporals 
  nearly 
  meeting 
  above 
  the 
  supraoccipital. 
  

   No 
  air-bladder. 
  

  

  Synopsis 
  of 
  the 
  Genera 
  of 
  Sudidse. 
  

  

  I. 
  Body 
  moderately 
  elongate, 
  subcylindrical 
  ; 
  head 
  as 
  broad 
  as 
  deep 
  ; 
  

  

  snout 
  rather 
  short 
  ; 
  maxillary 
  reaching 
  to 
  below 
  anterior 
  part 
  or 
  

   middle 
  of 
  eye, 
  which 
  is 
  large 
  ; 
  pelvic 
  tins 
  below 
  the 
  dorsal. 
  

  

  1. 
  Chlorophthalmus. 
  

  

  II. 
  Body 
  elongate, 
  subcylindrical 
  or 
  compressed 
  ; 
  head 
  depressed, 
  with 
  

  

  the 
  snout 
  more 
  or 
  less 
  spatulate 
  ; 
  mouth 
  large, 
  the 
  maxillary 
  

   extending 
  beyond 
  the 
  eye 
  ; 
  pelvic 
  tins 
  in 
  advance 
  of 
  the 
  dorsal. 
  

  

  A. 
  None 
  of 
  the 
  tin-rays 
  prolonged. 
  

  

  Eyes 
  present, 
  moderately 
  large 
  2. 
  Bathysaurojms. 
  

  

  No 
  eyes 
  ; 
  a 
  paired 
  phosphorescent 
  organ 
  on 
  the 
  

   head, 
  covered 
  by 
  the 
  thin 
  frontal 
  bones, 
  to 
  the 
  

   lateral 
  edges 
  of 
  which 
  the 
  suborbitals 
  are 
  

   attached 
  3. 
  Ipnops. 
  

  

  B. 
  The 
  outermost 
  ray 
  of 
  the 
  pelvic 
  and 
  the 
  lowest 
  of 
  the 
  caudal 
  

  

  excessively 
  prolonged 
  ; 
  eyes 
  present, 
  small. 
  

  

  Pectorals 
  normally 
  formed 
  4. 
  Berthosaurus. 
  

  

  Pectoral 
  divided 
  into 
  two 
  subcontiguous 
  portions, 
  

  

  the 
  upper 
  part 
  7-rayed, 
  the 
  firat 
  ray 
  prolonged 
  

  

  and 
  bifid, 
  the 
  rest 
  gradually 
  decreasing 
  in 
  

  

  length 
  below, 
  the 
  lower 
  part 
  of 
  5 
  or 
  b' 
  simple 
  

  

  filamentous 
  rays 
  5. 
  Hemipterois. 
  

  

  C. 
  Outermost 
  pelvic 
  ray 
  usually 
  bifid, 
  or 
  the 
  two 
  branches 
  may 
  

  

  coalesce 
  ; 
  if 
  short 
  it 
  is 
  thick 
  and 
  flattened 
  distally 
  ; 
  if 
  prolonged 
  

  

  