﻿Gatty 
  Marine 
  Laboratory 
  , 
  St. 
  Andreios. 
  79 
  

  

  backward 
  behind 
  the 
  flipper, 
  where 
  the 
  lower 
  (or 
  inner) 
  one 
  

   rather 
  rapidly 
  widened 
  and 
  split 
  into 
  two, 
  which 
  became 
  

   broader, 
  as 
  usual, 
  in 
  their 
  backward 
  progress. 
  The 
  next 
  

   furrow 
  Avas 
  very 
  narrow 
  under 
  the 
  jaw, 
  but 
  gradually 
  in- 
  

   creased 
  into 
  a 
  broad 
  ridge 
  in 
  its 
  course 
  along 
  the 
  region 
  

   behind 
  the 
  flipper. 
  The 
  succeeding 
  narrow 
  ridge 
  split 
  about 
  

   the 
  middle 
  of 
  the 
  sul)lingual 
  region, 
  the 
  left 
  ridge 
  running- 
  

   backward 
  to 
  a 
  point 
  considerably 
  behind 
  the 
  flipper, 
  where 
  it 
  

   ceased, 
  nearly 
  in 
  a 
  line 
  with 
  the 
  letters 
  J. 
  P. 
  cut 
  into 
  the 
  

   skin, 
  a 
  single 
  broad 
  ridge 
  (3 
  inches) 
  passing 
  backward 
  

   behind 
  this 
  point 
  But 
  the 
  second 
  or 
  inner 
  ridge 
  formed 
  by 
  

   the 
  split 
  was 
  still 
  more 
  interesting, 
  for 
  it 
  terminated 
  by 
  

   fusing 
  with 
  the 
  narrow 
  ridge 
  to 
  its 
  inner 
  or 
  right 
  side 
  about 
  

   a 
  line 
  midway 
  between 
  the 
  eye 
  and 
  the 
  anterior 
  border 
  of 
  the 
  

   flipper 
  (insertion 
  ofj, 
  the 
  single 
  ridge 
  then 
  coursing 
  back- 
  

   ward 
  to 
  join 
  the 
  previous 
  one 
  in 
  forming 
  the 
  broad 
  abdominal 
  

   ridge 
  (3 
  inches) 
  formerly 
  mentioned. 
  The 
  sublingual 
  ridge 
  

   to 
  the 
  right 
  sj^lit 
  about 
  a 
  transverse 
  line 
  from 
  the 
  mandibular 
  

   condyle, 
  the 
  separating 
  furrow 
  ending 
  a 
  little 
  in 
  front 
  of 
  the 
  

   previous 
  one 
  and 
  the 
  letters 
  J. 
  P., 
  a 
  broad 
  rirlge 
  not 
  quite 
  

   3 
  inches 
  remaining 
  to 
  the 
  rear. 
  Two 
  subgular 
  ridges 
  to 
  the 
  

   right, 
  fused 
  at 
  a 
  line 
  a 
  little 
  in 
  front 
  of 
  the 
  flipper, 
  contracted 
  

   to 
  a 
  narrower 
  single 
  ridge, 
  the 
  furrow 
  ceasing 
  under 
  the 
  

   letters 
  J. 
  P., 
  leaving 
  posteriorly 
  a 
  broad 
  smooth 
  area 
  more 
  

   than 
  double 
  the 
  breadth 
  of 
  the 
  widest 
  ridge 
  previously 
  

   described. 
  The 
  adjoining 
  furrow 
  to 
  the 
  right 
  presented 
  a 
  

   rudimentary 
  split 
  at 
  its 
  inner 
  edge 
  in 
  a 
  line 
  with 
  the 
  flipper, 
  

   but 
  it 
  soon 
  ceased, 
  and 
  the 
  furrow 
  to 
  the 
  right 
  terminated 
  a 
  

   little 
  short 
  of 
  the 
  previous 
  one. 
  The 
  next 
  ridge 
  (to 
  the 
  

   right) 
  was 
  split 
  about 
  the 
  middle 
  of 
  the 
  sublingual 
  region, 
  

   its 
  lower 
  limb 
  forking 
  again 
  in 
  a 
  line 
  with 
  the 
  eye, 
  whereas 
  

   the 
  next 
  one 
  (also 
  to 
  the 
  right) 
  fused 
  with 
  its 
  neighbour 
  to 
  

   form 
  a 
  single 
  ridge 
  at 
  the 
  same 
  line. 
  The 
  ridges 
  slightly 
  

   widen 
  from 
  the 
  articulation 
  of 
  the 
  mandible 
  forward 
  to 
  its 
  

   edge, 
  the 
  narrowest 
  part 
  being 
  the 
  region 
  of 
  the 
  throat, 
  and 
  

   some 
  below 
  the 
  eye 
  are 
  short, 
  ending 
  after 
  a 
  brief 
  course 
  on 
  

   the 
  side 
  or 
  fusing 
  into 
  a 
  single 
  ridge. 
  Moreover, 
  whilst 
  the 
  

   ridges, 
  as 
  a 
  rule, 
  are 
  pale, 
  the 
  furrows 
  have 
  much 
  dark 
  

   pigment. 
  This 
  description 
  leaves 
  about 
  half 
  the 
  series 
  

   (to 
  the 
  right) 
  untouched, 
  but 
  it 
  Avill 
  suffice 
  to 
  indicate 
  that, 
  

   whilst 
  there 
  is 
  truly 
  a 
  parallelism 
  in 
  the 
  ridges, 
  the 
  condition 
  

   is 
  more 
  complex, 
  as 
  the 
  accompanying 
  photograph 
  will 
  

   show. 
  Mr. 
  Beddard 
  and 
  others 
  are 
  inclined 
  to 
  think 
  that 
  

   these 
  ridges 
  are 
  useful 
  to 
  the 
  animal 
  in 
  distention 
  of 
  the 
  

   mouth 
  and 
  gullet 
  in 
  taking 
  food 
  (fishes 
  &c.), 
  but, 
  as 
  they 
  also 
  

  

  