﻿On 
  new 
  Asiatic 
  Muridre. 
  

  

  205 
  

  

  abdomen 
  seems 
  to 
  be 
  very 
  distensible 
  and 
  the 
  vent 
  is 
  situated 
  

   just 
  in 
  front 
  of 
  the 
  anal 
  fin. 
  The 
  myotomes 
  number 
  about 
  

   62. 
  The 
  caudal 
  fin 
  has 
  19 
  principal 
  rays 
  and 
  there 
  are 
  18 
  

   rays 
  in 
  the 
  dorsal 
  fin, 
  12 
  in 
  the 
  anal, 
  16 
  in 
  the 
  pectoral, 
  and 
  

   8 
  in 
  the 
  pelvic 
  ; 
  all 
  the 
  rays 
  of 
  the 
  dorsal, 
  anal, 
  and 
  pelvic 
  

   fins 
  appear 
  to 
  be 
  very 
  elongate 
  and 
  unbranched, 
  but 
  some 
  of 
  

   them 
  may 
  have 
  been 
  branched 
  distally 
  ; 
  the 
  pelvic 
  fins 
  are 
  

   rather 
  widely 
  separated 
  and 
  are 
  inserted 
  just 
  behind 
  the 
  

   pectorals. 
  The 
  gill-membranes 
  are 
  free 
  from 
  the 
  isthmus 
  

   and 
  the 
  branchiostegals 
  are 
  rather 
  long, 
  slender, 
  and 
  curved, 
  

  

  Macristium 
  chavesi 
  (slightly 
  reduced), 
  a, 
  head 
  from 
  above. 
  

  

  about 
  8 
  in 
  number 
  on 
  each 
  side 
  ; 
  there 
  are 
  4 
  gills 
  and 
  no 
  

   pseudobranchise. 
  Small 
  acutely 
  pointed 
  teeth 
  are 
  present 
  in 
  

   the 
  lower 
  jaw 
  and 
  on 
  the 
  vomer, 
  palatines, 
  and 
  tongue 
  ; 
  the 
  

   maxillary 
  is 
  broad, 
  rounded 
  posteriorly, 
  without 
  supra- 
  

   maxillary. 
  There 
  are 
  two 
  nostrils 
  on 
  each 
  side 
  which 
  are 
  

   superior 
  rather 
  than 
  lateral 
  in 
  position 
  and 
  lie 
  near 
  the 
  end 
  

   of 
  the 
  snout 
  in 
  front 
  of 
  the 
  anterior 
  end 
  of 
  what 
  appears 
  to 
  

   be 
  an 
  elongate 
  supraorbital 
  bone 
  ; 
  the 
  head 
  is 
  flattish 
  above 
  

   and 
  the 
  frontals 
  are 
  slightly 
  raised 
  above 
  each 
  eye. 
  The 
  

   post-temporals 
  approach 
  each 
  other 
  rather 
  closely 
  in 
  the 
  

   occipital 
  region. 
  

  

  XX. 
  — 
  New 
  Asiatic 
  Muridae. 
  By 
  Oldfield 
  Thomas. 
  

   (Published 
  by 
  permission 
  of 
  the 
  Trustees 
  of 
  the 
  British 
  Museum.) 
  

  

  Epimys 
  whitehead 
  i 
  perlutus, 
  subsp. 
  n. 
  

  

  Essential 
  characters 
  of 
  true 
  whiteheadi, 
  but 
  with 
  larger 
  

   skull 
  and 
  greyish 
  belly. 
  

  

  