﻿COOEE 
  : 
  THE 
  EADULA 
  IN 
  THAIS, 
  ETC. 
  95 
  

  

  floridana, 
  Conr. 
  : 
  Vera 
  Cruz. 
  Central 
  cusp 
  long, 
  sharp 
  and 
  

   rather 
  narrow, 
  side 
  cusps 
  about 
  two-thirds 
  the 
  lengtli, 
  broad 
  below, 
  

   conspicuouslj^ 
  denticled 
  high 
  up 
  on 
  the 
  inside, 
  denticle 
  clinging 
  close 
  

   to 
  the 
  cusp 
  ; 
  outside, 
  3-4 
  prominent 
  denticles, 
  one 
  climbing 
  ; 
  knob 
  

   elevated 
  and 
  prominent 
  ; 
  base 
  straight, 
  as 
  in 
  hcemastoma. 
  

  

  gemmulata, 
  Lam. 
  (= 
  mancmella, 
  L., 
  pars). 
  Central 
  tooth 
  long, 
  

   thick, 
  and 
  broad, 
  ratlier 
  deeply 
  set 
  in 
  the 
  upper 
  margin 
  ; 
  side 
  cusps 
  

   small 
  in 
  comparison, 
  not 
  denticled, 
  but 
  there 
  is 
  a 
  sliglit 
  broadening 
  

   of 
  the 
  lower 
  part 
  of 
  the 
  inner 
  edge, 
  as 
  draAvn 
  by 
  Troschel 
  ; 
  no 
  

   outside 
  denticles, 
  knob 
  just 
  a 
  raised 
  hump. 
  A 
  Cambridge 
  specimen 
  

   shows 
  throughout 
  a 
  tiny 
  sharp 
  denticle, 
  closely 
  adherent 
  to 
  the 
  

   inside 
  of 
  the 
  side 
  cusps 
  at 
  the 
  base. 
  In 
  a 
  specimen 
  from 
  Durban 
  

   the 
  broadening 
  of 
  the 
  inner 
  edge 
  almost 
  amounts 
  to 
  a 
  blunt 
  denticle 
  ; 
  

   in 
  one 
  from 
  liotuma 
  the 
  knob 
  is 
  prominent. 
  (Fig. 
  1.) 
  

  

  hcemastoma, 
  L. 
  The 
  rhachidian 
  tooth 
  of 
  this 
  widely 
  distributed 
  

   species 
  shows, 
  within 
  limits, 
  certain 
  variations 
  in 
  the 
  position 
  and 
  

   number 
  of 
  the 
  denticles. 
  The 
  central 
  cusp 
  is 
  always 
  strong, 
  broad, 
  

   and 
  long-pointed, 
  often 
  expanding 
  broadly 
  at 
  the 
  base 
  ; 
  the 
  side 
  cusps 
  

   are 
  about 
  two-thirds 
  the 
  length 
  of 
  the 
  central, 
  and 
  widen 
  greatly 
  below 
  

   the 
  denticle, 
  which 
  is 
  always 
  high 
  up, 
  in 
  a 
  specimen 
  from 
  Algiers 
  

   very 
  high 
  ; 
  outside, 
  the 
  denticles 
  are 
  strong, 
  prominent, 
  and 
  deeply 
  

   cut; 
  one 
  from 
  Cape 
  Verd 
  has 
  four, 
  one 
  very 
  small, 
  climbing 
  higli, 
  

   another 
  adherent 
  and 
  climbing 
  ; 
  a 
  Pernambuco 
  specimen 
  has 
  three, 
  one 
  

   climbing 
  high 
  ; 
  a 
  Dominica 
  specimen 
  has 
  four 
  strong 
  denticles, 
  which 
  

   correspond 
  exactly 
  to 
  those 
  in 
  the 
  Cape 
  Verd 
  specimen, 
  and 
  the 
  

   same 
  features 
  ai'e 
  repeated 
  in 
  a 
  Bermuda 
  specimen 
  (labelled 
  fasciata, 
  

   lleeve). 
  In 
  a 
  Demerara 
  specimen 
  the 
  denticle 
  inside 
  the 
  side 
  cusps 
  

   is 
  unusually 
  prominent 
  and 
  thick, 
  there 
  are 
  two 
  climbing 
  denticles 
  on 
  

   the 
  outside, 
  and 
  2-3 
  more 
  bej-ond. 
  (Fig. 
  16.) 
  

  

  hippocastcinea, 
  Lam. 
  : 
  Funafuti. 
  Central 
  cusp 
  broad, 
  sharply 
  pointed, 
  

   side 
  cusps 
  about 
  two-thirds 
  its 
  length, 
  bluntly 
  denticled 
  low 
  down 
  

   inside; 
  outside, 
  2-3 
  very 
  minute 
  denticles, 
  mere 
  wrinkles 
  in 
  some 
  

   specimens; 
  knob 
  small, 
  slightly 
  elevated. 
  

  

  inermis, 
  lleeve: 
  Cape 
  Verd. 
  Central 
  cusp 
  long, 
  thick 
  but 
  rather 
  

   narrow, 
  side 
  cusps 
  strong, 
  strongly 
  denticled 
  inside 
  ; 
  two 
  outer 
  

   denticles, 
  one 
  of 
  which 
  is 
  climbing, 
  knob 
  rather 
  prominent; 
  blade 
  of 
  

   laterals 
  rather 
  narrow. 
  

  

  intermedia, 
  Kien. 
  : 
  Hilo, 
  Hawaii 
  ; 
  Mauritius. 
  Central 
  cusp 
  broad, 
  

   side 
  cusps 
  with 
  a 
  prominent 
  well-cut 
  denticle 
  low 
  down 
  on 
  the 
  

   inside, 
  practically 
  detached 
  from 
  the 
  cusp, 
  seemingly 
  almost 
  half- 
  

   way 
  between 
  it 
  and 
  the 
  central 
  cusp, 
  the 
  denticle 
  bulges 
  inwards 
  on 
  

   the 
  inside, 
  while 
  the 
  apex 
  points 
  towards 
  the 
  side 
  cusp, 
  its 
  root 
  is 
  

   a 
  little 
  sunk 
  in 
  the 
  mass 
  of 
  the 
  tooth 
  ; 
  outside, 
  no 
  outer 
  denticles, 
  

   only 
  some 
  faint 
  wrinkles. 
  Generally 
  regarded 
  as 
  variety 
  of 
  

   hippocastanea, 
  Lam. 
  (Fig. 
  4.) 
  

  

  Jciosquiformis, 
  Duel. 
  : 
  Panama. 
  Central 
  cusp 
  thin, 
  transparent, 
  

   twice 
  as 
  long 
  as 
  the 
  side 
  cusps, 
  which 
  incline 
  outwards, 
  and 
  have 
  

   a 
  strong 
  sharp 
  denticle 
  high 
  up 
  on 
  the 
  inside 
  ; 
  outside, 
  3-5 
  well- 
  

   marked 
  denticles, 
  1-2 
  of 
  which 
  are 
  climbing; 
  knob 
  strong, 
  

   prominent. 
  (Fig. 
  14.) 
  

  

  