﻿COOKE 
  : 
  THE 
  EADULA 
  IN 
  THAIS, 
  ETC. 
  93 
  

  

  small 
  denticles, 
  avIucIi 
  in 
  some 
  cases 
  are 
  scarcely 
  more 
  than 
  wrinkles 
  ; 
  

   knob 
  small, 
  blunt. 
  

  

  blanfordi, 
  Melv. 
  : 
  Charbar. 
  Central 
  cusp 
  long, 
  sharply 
  pointed, 
  

   side 
  cusps 
  much 
  shorter, 
  broadening 
  at 
  the 
  base, 
  a 
  prominent 
  blunt 
  

   denticle 
  on 
  the 
  inside 
  ; 
  outside, 
  three 
  to 
  four 
  inconspicuous 
  denticles, 
  

   two 
  of 
  wliich 
  climb 
  ; 
  knob 
  prominent, 
  elevated. 
  

  

  brevidentata, 
  Wood: 
  Panama. 
  Central 
  cusp 
  strong, 
  sharply 
  

   pointed, 
  side 
  cusps 
  sharp, 
  with 
  a 
  strong 
  denticle 
  on 
  the 
  inside, 
  half- 
  

   way 
  up; 
  outside, 
  three 
  to 
  four 
  small 
  denticles, 
  scarcely 
  climbing'; 
  

   knob 
  prominent. 
  

  

  See 
  Proc. 
  Malac. 
  Soc, 
  xiii, 
  1918, 
  p. 
  7, 
  for 
  the 
  reasons 
  for 
  

   transferring 
  this 
  species 
  from 
  Acanthina 
  to 
  Thais. 
  

  

  bronni, 
  Dunk. 
  : 
  Japan. 
  Central 
  cusp 
  long, 
  narroAv, 
  sharply 
  

   pointed, 
  side 
  cusps 
  considerably 
  shorter, 
  with 
  a 
  strong 
  broad 
  denticle 
  

   about 
  half-way 
  down 
  on 
  the 
  inside; 
  outside, 
  5-7 
  prominent 
  sharp 
  

   denticles, 
  2-3 
  of 
  which 
  climb, 
  one 
  rather 
  high 
  up 
  ; 
  knob 
  prominent 
  ; 
  

   base 
  narrowed 
  in 
  the 
  centre. 
  (Fig. 
  7.) 
  

  

  In 
  other 
  words, 
  the 
  radula 
  corresponds 
  most 
  closely 
  to 
  that 
  of 
  

   clavigera. 
  

  

  bufo, 
  Lam.: 
  Ilmkomaas, 
  Natal; 
  Charbar. 
  Central 
  cusp 
  rather 
  

   long, 
  sharp, 
  and 
  narrow, 
  root 
  deeply 
  set 
  in 
  the 
  upper 
  part 
  of 
  the 
  

   plate, 
  but 
  not 
  carried 
  through 
  to 
  the 
  base, 
  there 
  are 
  signs 
  of 
  

   '' 
  guards 
  " 
  or 
  side 
  buttresses 
  ; 
  side 
  cusps 
  not 
  much 
  shorter 
  but 
  

   broader, 
  suddenly 
  widening 
  above 
  a 
  broad 
  denticle 
  on 
  the 
  inside, 
  

   wliich 
  is 
  always 
  more 
  or 
  less 
  freakish, 
  being 
  markedly 
  turreted 
  in 
  

   some 
  specimens, 
  in 
  others 
  roughly 
  hewn 
  or 
  humped, 
  often 
  higher 
  up 
  

   in 
  one 
  cusp 
  than, 
  the 
  other; 
  outside, 
  4-5 
  climbing 
  denticles, 
  

   reaching 
  almost 
  to 
  the 
  top 
  of 
  the 
  cusp, 
  continued 
  by 
  4-5 
  prominent 
  

   sharp 
  toothlets 
  often 
  irregular 
  in 
  shape 
  and 
  size; 
  knob 
  prominent, 
  

   at 
  times 
  bluntly 
  or 
  sharply 
  bifid. 
  (Fig. 
  9.) 
  

  

  A 
  most 
  cbaracteristie 
  and, 
  as 
  regards 
  the 
  denticles, 
  freakish 
  radula. 
  

  

  capensis, 
  Petit 
  : 
  Natal. 
  Central 
  cusp 
  long, 
  narrow, 
  side 
  cusps 
  

   three-fourths 
  length 
  of 
  central, 
  sharply 
  pointed, 
  strongly 
  and 
  often 
  

   irregularly 
  denticled 
  half-way 
  down 
  on 
  inside, 
  sometimes 
  as 
  if 
  a 
  bit 
  had 
  

   been 
  hacked 
  out 
  and 
  a 
  blunt 
  denticle 
  left 
  above 
  it 
  ; 
  in 
  a 
  specimen 
  from 
  

   Scottburgh 
  the 
  denticle 
  is 
  very 
  rude, 
  blunted 
  or 
  occasionally 
  bifid 
  ; 
  

   nothing 
  outside 
  at 
  all 
  — 
  no 
  regular 
  knob, 
  but 
  margin 
  a 
  little 
  raised. 
  

  

  carinifera, 
  Lam. 
  : 
  Penang. 
  Central 
  cusp 
  very 
  long 
  and 
  narrow, 
  

   three 
  times 
  as 
  long 
  as 
  the 
  side 
  cusps, 
  which 
  are 
  short, 
  broad, 
  with 
  

   a 
  sharp 
  denticle 
  high 
  up 
  on 
  inside 
  ; 
  three 
  prominent 
  denticles 
  outside, 
  

   with 
  a 
  fourth 
  which 
  climbs 
  high 
  ; 
  knob 
  blunt, 
  conspicuous 
  ; 
  base 
  

   straight. 
  

  

  In 
  a 
  Karachi 
  specimen 
  the 
  length 
  of 
  the 
  central 
  cusp 
  is 
  

   considerably 
  reduced. 
  

  

  caroleftsis, 
  Ileeve 
  : 
  Panama. 
  Central 
  cusp 
  short, 
  broad 
  and 
  rather 
  

   blunt, 
  side 
  cusps 
  of 
  nearly 
  equal 
  length, 
  very 
  broadly 
  bluntly 
  

   denticled 
  inside 
  ; 
  outside, 
  two 
  well-marked 
  denticles, 
  one 
  of 
  which 
  is 
  

   closely 
  adjacent 
  to 
  the 
  side 
  cusp; 
  knob 
  blunt, 
  not 
  conspicuous. 
  

  

  eataracta, 
  Chera. 
  : 
  Cape 
  of 
  Good 
  Hope. 
  Central 
  and 
  side 
  cusps 
  

   sharp, 
  the 
  side 
  cusps 
  broadening 
  out 
  irregularly 
  above 
  the 
  upper 
  

  

  