﻿MOLLUSCA. 
  79 
  

  

  arciiate. 
  Last 
  valve 
  of 
  a 
  narrow 
  acutely 
  elliptic 
  form, 
  with 
  the 
  

   mucro 
  probably 
  near 
  the 
  centre. 
  Interior 
  of 
  the 
  plates 
  greenish 
  

   blue, 
  stained 
  dark 
  brown 
  in 
  the 
  middle. 
  Lamina 
  of 
  insertion 
  in 
  the 
  

   froi]t 
  plate 
  with 
  about 
  ten 
  notches 
  at 
  unequal 
  distances, 
  leaving 
  

   different-sized 
  teeth 
  between 
  them, 
  which 
  are 
  striated 
  on 
  both 
  sides, 
  

   but 
  more 
  strongly 
  externally, 
  their 
  edges 
  being 
  sharp, 
  but 
  not 
  

   smooth. 
  The 
  central 
  plates 
  have 
  a 
  single 
  minute 
  notcli 
  on 
  each 
  

   side, 
  the 
  insertion-lamina 
  being 
  comparatively 
  smooth 
  on 
  the 
  upper 
  

   surface 
  and 
  marked 
  with 
  a 
  small 
  brown 
  spot 
  on 
  each 
  side 
  against 
  

   the 
  edge 
  of 
  the 
  valve. 
  Tail-plate 
  much 
  thickened 
  within 
  along 
  the 
  

   posterior 
  edge, 
  which 
  is 
  roughened 
  by 
  fine 
  cross 
  stria^, 
  there 
  being 
  

   no 
  prominent 
  teeth, 
  and 
  of 
  course 
  no 
  notches. 
  Mantle-margin 
  

   covered 
  with 
  small 
  subimbricating 
  oval 
  granules. 
  Length 
  without 
  

   margin 
  10 
  millim. 
  ; 
  width 
  of 
  fourth 
  plate 
  9. 
  

  

  Hab. 
  Port 
  Curtis 
  (Cojypiiir/e)-). 
  

  

  The 
  granules 
  of 
  the 
  surface 
  have 
  an 
  irregular 
  concentric 
  dis- 
  

   position, 
  following 
  to 
  some 
  extent 
  the 
  lines 
  of 
  growth. 
  

  

  109. 
  Chiton 
  (Ischnochiton 
  ?) 
  adelaidensis. 
  

  

  Reeve, 
  Conch. 
  Icon. 
  fig. 
  123. 
  

  

  Uah. 
  Port 
  Molle, 
  Queensland 
  {Coppinfjer) 
  ; 
  Port 
  Adelaide 
  {Reeve). 
  

  

  The 
  entire 
  surface 
  of 
  this 
  species 
  is 
  minutely 
  granoscly 
  reticulated, 
  

   the 
  front 
  valve, 
  the 
  lateral 
  areas 
  of 
  the 
  narrow 
  central 
  valves, 
  and 
  

   the 
  hinder 
  area 
  of 
  the 
  posterior 
  are 
  in 
  addition 
  somewhat 
  irregularly 
  

   radiately 
  sulcate. 
  The 
  prevailing 
  colour 
  is 
  pale 
  greenish, 
  streaked 
  

   and 
  dotted 
  with 
  red, 
  the 
  posterior 
  margin 
  of 
  the 
  valves 
  being 
  paler 
  

   than 
  the 
  general 
  tone 
  of 
  the 
  shell, 
  and 
  conspicuously 
  spotted 
  with 
  

   the 
  same 
  red 
  colour. 
  The 
  grains 
  of 
  the 
  mantle 
  are 
  smooth, 
  arranged 
  

   in 
  alternate 
  greenish 
  and 
  reddish 
  patches, 
  and 
  individually 
  have 
  a 
  

   dark 
  spot 
  generally 
  on 
  the 
  outer 
  side, 
  which 
  is 
  only 
  seen 
  under 
  

   a 
  lens 
  ; 
  those 
  near 
  the 
  valves 
  are 
  considerably 
  smaller 
  than 
  those 
  

   situated 
  towards 
  the 
  edge 
  of 
  the 
  girdle. 
  Having 
  parted 
  the 
  valves 
  

   of 
  one 
  of 
  the 
  specimens 
  I 
  find 
  the 
  front 
  one 
  has 
  the 
  margin 
  of 
  

   insertion 
  divided 
  into 
  seventeen 
  unequal, 
  squarely 
  cut, 
  slightly 
  

   crinkled, 
  sharp-edged 
  teeth, 
  of 
  which 
  the 
  two 
  outer 
  on 
  each 
  side 
  are 
  

   the 
  largest. 
  The 
  sixteen 
  slits 
  between 
  the 
  teeth 
  are 
  very 
  small 
  and 
  

   shallow. 
  The 
  second, 
  third, 
  fourth, 
  fifth, 
  and 
  sixth 
  valves 
  have 
  

   on 
  each 
  side 
  a 
  single 
  very 
  small 
  narrow 
  central 
  notch, 
  from 
  which 
  a 
  

   groove 
  or 
  depression 
  runs 
  to 
  the 
  apex 
  of 
  each 
  valve 
  ; 
  the 
  seventh 
  is 
  

   probably 
  abnormal, 
  having 
  a 
  single 
  notch 
  on 
  the 
  right 
  side 
  and 
  two 
  

   on 
  the 
  left, 
  and 
  the 
  terminal 
  valve 
  has 
  nineteen 
  similar 
  slits. 
  

  

  110. 
  Chiton 
  (CallistocMton) 
  antiquus. 
  

  

  Chiton 
  antiquus, 
  Heeve, 
  Conch. 
  Icon. 
  fig. 
  1G9. 
  

   Callistochiton 
  sarcophagus, 
  Carpenter, 
  MS. 
  in 
  Coll. 
  Cuming. 
  

  

  Hab. 
  Australia 
  (lleeve) 
  ; 
  Port 
  Molle, 
  Queensland 
  {Coppinger); 
  

   Port 
  Jackson, 
  rare 
  (Anr/as). 
  

  

  Reeve's 
  figure 
  of 
  this 
  species 
  is 
  much 
  enlarged, 
  the 
  type 
  shell 
  

  

  