﻿188 
  Rev. 
  A. 
  Matthews 
  on 
  new 
  

  

  Fig. 
  13. 
  Transverse 
  section 
  through 
  the 
  sinus 
  rhomboidalis 
  at 
  the 
  point 
  

   where 
  the 
  multiaxial 
  fibre 
  decussates. 
  

  

  Fig. 
  14. 
  Transverse 
  section 
  through 
  the 
  sinus 
  rhomboidalis 
  at 
  the 
  appa- 
  

   rent 
  origin 
  of 
  the 
  vagus, 
  X 
  14. 
  

  

  Fig. 
  15. 
  Transverse 
  section 
  through 
  the 
  spinal 
  cord 
  a 
  short 
  distance 
  be- 
  

   hind 
  the 
  fourth 
  ventricle. 
  Some 
  of 
  the 
  detail 
  was 
  added 
  from 
  

   another 
  specimen. 
  X 
  24. 
  

  

  Fig. 
  16. 
  Transverse 
  section 
  through 
  the 
  middle 
  portion 
  of 
  the 
  spinal 
  cord, 
  

   X 
  24. 
  

  

  Fig. 
  17. 
  Transverse 
  section 
  through 
  the 
  posterior 
  part 
  of 
  the 
  spinal 
  cord, 
  

   X 
  24. 
  

  

  Fig. 
  18. 
  Two 
  cells 
  from 
  the 
  ventral 
  ganglion 
  of 
  the 
  cord 
  : 
  v, 
  the 
  side 
  

   turned 
  towards 
  the 
  ventral 
  edge 
  ; 
  d, 
  the 
  side 
  turned 
  towards 
  the 
  

   dorsal 
  edge 
  ; 
  the 
  grey 
  substance 
  of 
  the 
  ventral 
  horn 
  is 
  situated 
  

   between 
  the 
  two 
  on 
  the 
  concave 
  side 
  of 
  the 
  upper 
  and 
  on 
  the 
  

   convex 
  side 
  of 
  the 
  lower 
  cell. 
  X 
  65. 
  

  

  Fig. 
  19. 
  Section 
  through 
  the 
  multiaxial 
  fibre 
  : 
  m. 
  s., 
  medullary 
  sheath 
  ; 
  

   a. 
  c, 
  axis-cylinders 
  ; 
  b, 
  the 
  axis-cylinder 
  destined 
  to 
  decussate. 
  

   X 
  120. 
  

  

  Fig. 
  20. 
  Cells 
  from 
  the 
  roof-ganglion 
  of 
  the 
  optic 
  lobe, 
  X 
  180. 
  

  

  Fig. 
  21 
  . 
  Transverse 
  section 
  through 
  the 
  olfactory 
  lobe, 
  X 
  180. 
  

  

  Fig. 
  22. 
  Longitudinal 
  and 
  vertical 
  section 
  through 
  the 
  dorsal 
  part 
  of 
  the 
  

   cerebrum, 
  X 
  180. 
  

  

  Fig. 
  23. 
  Transverse 
  section 
  through 
  the 
  optic 
  lobe, 
  X 
  180. 
  

  

  XIX. 
  — 
  New 
  Genera 
  and 
  Species 
  o/'Trichopterygidas. 
  

   By 
  Rev. 
  A. 
  Matthews. 
  

  

  The 
  Trichopterygidas 
  have 
  numerically 
  increased 
  to 
  such 
  an 
  

   extent 
  since 
  the 
  publication 
  of 
  the 
  ' 
  Trichopteiygia 
  Illus- 
  

   trata' 
  in 
  1872, 
  that 
  I 
  have 
  for 
  some 
  time 
  contemplated 
  

   adding 
  a 
  second 
  part 
  to 
  that 
  work. 
  Many 
  of 
  the 
  new 
  species 
  

   have 
  been 
  already 
  described 
  in 
  various 
  periodical 
  and 
  other 
  

   works, 
  but 
  some 
  few 
  still 
  remain 
  unnoticed. 
  And 
  since 
  the 
  

   publication 
  of 
  a 
  more 
  comprehensive 
  work 
  has 
  hitherto 
  been, 
  

   and 
  may 
  yet 
  be, 
  retarded 
  by 
  causes 
  over 
  which 
  I 
  have 
  no 
  

   control, 
  I 
  propose 
  in 
  the 
  following 
  pages 
  to 
  give 
  a 
  short 
  sum- 
  

   mary 
  of 
  their 
  chief 
  distinctive 
  characters, 
  reserving 
  more 
  

   detailed 
  descriptions 
  to 
  some 
  future 
  period. 
  

  

  The 
  two 
  new 
  genera 
  described 
  in 
  this 
  paper 
  are 
  both 
  of 
  a 
  

   most 
  extraordinary 
  and 
  novel 
  character, 
  and 
  extremely 
  ele- 
  

   gant 
  in 
  form. 
  In 
  Mikado 
  the 
  front 
  of 
  the 
  head 
  is 
  produced 
  

   into 
  an 
  elongated 
  snout 
  or 
  rostrum, 
  after 
  the 
  manner 
  of 
  some 
  

   species 
  of 
  Bhinosimus 
  ; 
  but 
  this 
  part 
  is 
  deflexed, 
  and, 
  when 
  at 
  

   rest, 
  laid 
  upon 
  the 
  presternum, 
  so 
  that, 
  if 
  viewed 
  from 
  above, 
  

   the 
  head 
  presents 
  the 
  appearance 
  usual 
  to 
  Trichopteryx. 
  In 
  

   Dimorphella, 
  as 
  its 
  name 
  implies, 
  the 
  sexes 
  would 
  appear 
  

  

  