﻿84 
  COLLECTIONS 
  FROM 
  MELANESIA, 
  

  

  The 
  single 
  specimen 
  from 
  the 
  latter 
  locality 
  is 
  rather 
  more 
  coarsely 
  

   granulated 
  than 
  those 
  from 
  Flinders 
  Island, 
  which 
  have 
  been 
  exa- 
  

   mined 
  by 
  the 
  late 
  Dr. 
  P. 
  P. 
  Carpenter, 
  and 
  bear 
  his 
  manuscript 
  

   name 
  ashestoides. 
  

  

  117. 
  Chiton 
  (Tonicia) 
  fortiliratus. 
  

  

  Chiton 
  fortiliratus, 
  Reeve, 
  Couch. 
  Icon. 
  fig. 
  112. 
  

  

  Hub. 
  Port 
  Darwin, 
  8-10 
  fms., 
  sand 
  and 
  mud 
  {Copping 
  er) 
  ; 
  

   Raines 
  Island, 
  Torres 
  Straits 
  {Reeve). 
  

  

  The 
  single 
  specimen 
  collected 
  by 
  Dr. 
  Coppinger 
  is 
  of 
  a 
  greyish- 
  

   pink 
  colour, 
  copiously 
  blotched 
  with 
  black 
  along 
  the 
  sides 
  of 
  some 
  

   of 
  the 
  valves. 
  The 
  head-plate 
  is 
  regularly 
  well-curved 
  forward, 
  

   rather 
  high, 
  the 
  posterior 
  margin 
  being 
  obtusely 
  angled 
  in 
  the 
  

   middle. 
  The 
  inserted 
  edge 
  is 
  much 
  thickened, 
  coarsely 
  striated 
  

   exteriorly 
  and 
  on 
  the 
  broad 
  margin, 
  and 
  divided 
  into 
  nine 
  unequal 
  

   parts 
  by 
  eight 
  short 
  narrow 
  slits. 
  The 
  exterior 
  surface 
  is 
  coarsely 
  

   subsquamately 
  granulated 
  throughout, 
  and 
  exhibits 
  numerous 
  minute 
  

   black 
  raised 
  dots, 
  disposed 
  in 
  rather 
  irregular 
  radiating 
  series. 
  The 
  

   second 
  valve 
  is 
  long 
  in 
  comparison 
  with 
  those 
  which 
  follow, 
  feebly 
  

   peaked 
  behind 
  ; 
  the 
  fourth, 
  fifth, 
  and 
  sixth 
  plates 
  are 
  about 
  equal 
  in 
  

   width 
  and 
  a 
  trifle 
  broader 
  than 
  the 
  third 
  and 
  seventh. 
  All 
  the 
  inter- 
  

   mediate 
  valves 
  are 
  \ery 
  coarsely 
  ridged 
  and 
  sulcated 
  on 
  the 
  central 
  

   areas, 
  and 
  coarsely 
  grained 
  and 
  minutely 
  black-dotted 
  at 
  the 
  sides. 
  

   The 
  ridges 
  are 
  flat-topped, 
  clean-cut, 
  nearly 
  smooth, 
  attenuated 
  

   posteriorly, 
  wavy, 
  converge 
  on 
  each 
  side 
  towards 
  the 
  front, 
  and 
  the 
  

   intervening 
  grooves 
  are 
  finely 
  punctate. 
  All 
  have 
  the 
  hinder 
  margin 
  

   nearly 
  straight, 
  and 
  but 
  very 
  feebly 
  pointed 
  at 
  the 
  posterior 
  apex. 
  

   The 
  laminaD 
  of 
  insertion 
  of 
  these 
  valves 
  are 
  thin, 
  narrow 
  at 
  the 
  

   sides, 
  moderately 
  deeply 
  sinuated 
  in 
  front, 
  strongly 
  striated 
  above 
  

   in 
  rear 
  of 
  and 
  for 
  a 
  short 
  distance 
  in 
  froijt 
  of 
  the 
  single 
  minute 
  

   lateral 
  slit 
  on 
  each 
  side. 
  The 
  posterior 
  valve 
  is 
  strong 
  and 
  thick, 
  

   obtusely 
  mucronated 
  at 
  the 
  centre, 
  very 
  coarsely 
  striated 
  and 
  ser- 
  

   rated 
  iipon 
  the 
  thickened 
  inserted 
  margin, 
  which 
  is 
  subdivided 
  by 
  

   about 
  ten 
  distinct 
  notches. 
  The 
  interior 
  of 
  the 
  valves 
  is 
  light 
  livid 
  

   bluish, 
  with 
  a 
  reddish 
  stain 
  along 
  the 
  middle 
  of 
  all, 
  with 
  the 
  excep- 
  

   tion 
  of 
  the 
  last. 
  The 
  mantle, 
  as 
  described 
  by 
  Reeve, 
  is 
  simply 
  

   " 
  horny." 
  Length 
  without 
  girdle 
  IS 
  millim., 
  diameter 
  of 
  fifth 
  

   valve 
  9. 
  

  

  The 
  type 
  is 
  a 
  larger 
  specimen, 
  being 
  24 
  millim. 
  long, 
  with 
  an 
  ex- 
  

   treme 
  width 
  of 
  13. 
  

  

  118. 
  Chiton 
  (Chitonellus) 
  striatus. 
  

  

  Cbitonellus 
  striatus, 
  Lamarck, 
  An. 
  s. 
  Vert. 
  ed. 
  2, 
  vol. 
  vii. 
  p. 
  481 
  ; 
  

  

  Sowerbif, 
  Gen. 
  fig. 
  4 
  ; 
  id. 
  Conch. 
  III. 
  tig. 
  62 
  ; 
  Reeve, 
  Conch. 
  Icon. 
  

  

  fig. 
  4; 
  Conch. 
  Syst. 
  pi. 
  135. 
  fig. 
  1. 
  

   Chitonellus 
  oculatus, 
  Reeve 
  (? 
  of 
  QuoiJ), 
  1. 
  c. 
  figs. 
  7 
  a, 
  b. 
  

   Var. 
  = 
  Chitonelkis 
  gunuii, 
  Reeve, 
  fig. 
  5. 
  

  

  Chitonellus 
  rostratus, 
  Reeve, 
  tig. 
  6. 
  

  

  