﻿semionotid^:. 
  83 
  

  

  inner 
  teeth 
  not 
  excessively 
  elarged, 
  the 
  

   majority 
  oval 
  and 
  with 
  apical 
  tubercle 
  ; 
  

   principal 
  flank-scales 
  with 
  few 
  large 
  

   denticulations 
  at 
  least 
  in 
  their 
  lower 
  half, 
  leedsi, 
  p. 
  99. 
  

   Innermost 
  splenial 
  teeth 
  excessively 
  enlarged, 
  

  

  round, 
  without 
  apical 
  tubercle 
  affinis, 
  p. 
  101. 
  

  

  Operculum 
  nearly 
  twice 
  as 
  deep 
  as 
  its 
  

   maximum 
  breadth, 
  which 
  equals 
  about 
  

   one-third 
  the 
  length 
  of 
  the 
  head 
  ; 
  

   inner 
  teeth 
  not 
  excessively 
  enlarged, 
  the 
  

   majority 
  oval 
  and 
  with 
  apical 
  tubercle; 
  

   scales 
  not 
  serrated, 
  but 
  the 
  postero- 
  

   inferior 
  angle 
  more 
  or 
  less 
  produced, 
  and 
  

   the 
  hinder 
  margin 
  often 
  with 
  one 
  or 
  

   two 
  notches 
  immediately 
  above 
  this 
  .... 
  ' 
  unguiculatm, 
  p. 
  102. 
  

   (b.) 
  Scales 
  in 
  part 
  marked 
  with 
  radiating 
  furrows. 
  

   Majority 
  of 
  inner 
  teeth 
  oval, 
  with 
  apical 
  

   tubercle, 
  those 
  of 
  splenial 
  in 
  more 
  than 
  

  

  three 
  irregular 
  concentric 
  series 
  Icevis, 
  p. 
  103. 
  

  

  Maximum 
  width 
  of 
  operculum 
  two-thirds 
  

   as 
  great 
  as 
  its 
  depth, 
  and 
  equalling 
  about 
  

   one-third 
  the 
  length 
  of 
  the 
  head 
  ; 
  maj 
  ority 
  

   of 
  inner 
  teeth 
  round, 
  without 
  apical 
  

   tubercle, 
  arranged 
  on 
  splenial 
  in 
  six 
  or 
  

  

  seven 
  irregular 
  concentric 
  series 
  palliatus, 
  p. 
  103. 
  

  

  Majority 
  of 
  inner 
  teeth 
  round, 
  without 
  apical 
  

   tubercle, 
  arranged 
  on 
  splenial 
  in 
  four 
  or 
  

  

  five 
  irregular 
  concentric 
  series 
  maximus, 
  p. 
  105. 
  

  

  (c.) 
  Scales 
  smooth, 
  but 
  exhibiting 
  nearly 
  par- 
  

   allel 
  transverse 
  grooves 
  when 
  abraded. 
  

   Maximum 
  width 
  of 
  operculum 
  nearly 
  two- 
  

   thirds 
  as 
  great 
  as 
  its 
  depth, 
  and 
  equal- 
  

   ling 
  about 
  one-third 
  the 
  length 
  of 
  the 
  

   head 
  ; 
  principal 
  flank-scales 
  more 
  or 
  less 
  

   coarsely 
  serrated, 
  sometimes 
  crimped; 
  

  

  dorsal 
  ridge-scales 
  inconspicuous 
  mantelli, 
  p. 
  108. 
  

  

  Maximum 
  width 
  of 
  operculum 
  about 
  two- 
  

   thirds 
  as 
  great 
  as 
  its 
  depth, 
  and 
  equal- 
  

   ling 
  one-half 
  the 
  length 
  of 
  the 
  head; 
  

   principal 
  flank-scales 
  with 
  two 
  or 
  three 
  

   very 
  large 
  denticulations 
  on 
  the 
  lower 
  

   half 
  of 
  their 
  posterior 
  border 
  ; 
  dorsal 
  

  

  ridge-scales 
  inconspicuous 
  degenhardbi, 
  p. 
  119. 
  

  

  Scales 
  with 
  long 
  slender 
  posterior 
  denticula- 
  

   tions 
  ; 
  principal 
  flank-scales 
  considerably 
  

   deeper 
  than 
  broad; 
  dorsal 
  ridge-scales 
  

   conspicuous 
  hauchecornei, 
  p. 
  119. 
  

  

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