﻿6 
  Mr. 
  C. 
  T. 
  Began 
  on 
  the 
  Anatomy 
  and 
  

  

  vomerine 
  teeth 
  sometimes 
  absent 
  and 
  anterior 
  supramaxillaiy 
  

   wanting; 
  a 
  single 
  large 
  supramaxillaiy, 
  superiorly 
  sending 
  

   forward 
  a 
  pointed 
  process 
  ; 
  subocular 
  shelf 
  a 
  small 
  or 
  slender 
  

   process 
  of 
  the 
  second 
  suborbital 
  ; 
  nasals 
  very 
  large, 
  united 
  

   by 
  suture 
  throughout 
  their 
  length, 
  covering 
  the 
  ethmoid 
  and 
  

   the 
  prsem 
  axillary 
  processes. 
  Frontals, 
  parietals, 
  and 
  supra- 
  

   occipital, 
  with 
  their 
  ridges 
  and 
  crests, 
  arranged 
  much 
  as 
  in 
  

   the 
  Berycidgfi. 
  Alisphenoids 
  separate, 
  bridged 
  by 
  the 
  orbito- 
  

   sphenoid. 
  Hypocoracoids 
  narrowed 
  forward 
  below, 
  not 
  

   reaching 
  the 
  ventral 
  profile, 
  not 
  embracing 
  the 
  pelvic 
  bones, 
  

   which 
  are 
  firmly 
  attached 
  to 
  the 
  cleithra 
  above 
  the 
  symphysis. 
  

   26 
  vertebras 
  ; 
  no 
  upturned 
  centra, 
  and 
  the 
  anterior 
  uroneural 
  

   ai 
  kylosed 
  with 
  the 
  last 
  centrum. 
  Abdomen 
  with 
  a 
  median 
  

   seiies 
  of 
  ridged 
  or 
  serrated 
  scales. 
  

  

  Recent 
  genera 
  are 
  Trachichthys, 
  Shaw, 
  Iloplostethusi, 
  Cuv. 
  

   &Val., 
  Paratrachichthys, 
  Waite, 
  and 
  Gephyroberyx, 
  Bouleng. 
  

   The 
  Cretaceous 
  Aipichthys, 
  Steind., 
  and 
  Acrogaster, 
  Agass., 
  

   may 
  be 
  provisionally 
  referred 
  to 
  this 
  family. 
  iSphenocejyhalus, 
  

   Agass., 
  shows 
  some 
  resemblance 
  to 
  Trachichthys, 
  but 
  does 
  

   not 
  seem 
  to 
  have 
  the 
  abdominal 
  series 
  of 
  ridged 
  scales. 
  

  

  Family 
  6. 
  Monocentridae. 
  

  

  Differs 
  from 
  the 
  preceding 
  only 
  in 
  the 
  large, 
  bony, 
  rigidly 
  

   united 
  scales, 
  the 
  absence 
  of 
  the 
  first 
  four 
  ribs, 
  and 
  the 
  reduc- 
  

   tion 
  of 
  the 
  pelvic 
  fin 
  to 
  a 
  spine 
  and 
  3 
  soft 
  rays. 
  The 
  trunk- 
  

   muscles 
  are 
  inserted 
  only 
  on 
  the 
  posterior 
  surface 
  of 
  the 
  

   skull, 
  and 
  on 
  the 
  upper 
  surface 
  the 
  occipital 
  and 
  parietal 
  

   crests 
  are 
  converted 
  into 
  ridges 
  bordering 
  mucous 
  channels. 
  

  

  One 
  genus, 
  Alonocentris, 
  Bl. 
  Schn. 
  

  

  Family 
  7. 
  Anomalopidse. 
  

  

  Differs 
  from 
  the 
  Trachichthyidas 
  in 
  the 
  absence 
  of 
  mucous 
  

   channels 
  on 
  the 
  head 
  and 
  in 
  the 
  presence 
  of 
  a 
  peculiar 
  evertible 
  

   subocular 
  luminous 
  organ. 
  

  

  There 
  is 
  a 
  single 
  example 
  of 
  Anomalops 
  katoptron, 
  Bleek., 
  

   in 
  the 
  British 
  Museum, 
  and 
  I 
  have 
  ascertained 
  that 
  the 
  nasal 
  

   bones, 
  the 
  orbitosphenoid, 
  and 
  the 
  supramaxillary 
  are 
  as 
  in 
  

   the 
  Trachichthyida?. 
  There 
  is 
  a 
  median 
  abdominal 
  series 
  of 
  

   ridged 
  scales 
  and 
  the 
  caudal 
  fin 
  has 
  17 
  branched 
  rays. 
  In 
  

   this 
  specimen 
  the 
  right 
  pelvic 
  fin 
  is 
  absent 
  and 
  the 
  left 
  has 
  

   only 
  4 
  rays 
  ; 
  these 
  fins 
  are 
  said 
  to 
  be 
  normally 
  6-rayed, 
  but 
  

   authors 
  disagree 
  as 
  to 
  whether 
  the 
  outer 
  ray 
  is 
  spinous 
  or 
  

   articulated. 
  Protoblepharon 
  palpebratus, 
  Bodd., 
  which 
  has 
  

   been 
  figured 
  by 
  Max 
  Weber 
  (< 
  biboga' 
  Exped. 
  p. 
  109, 
  1902) 
  

  

  