﻿MOLLUSC 
  A. 
  

  

  Cryptoplax 
  striata, 
  frunnii, 
  rostrata, 
  Adams, 
  Genera, 
  

   Angas, 
  Proc. 
  Zool. 
  Sue. 
  18G7, 
  pp. 
  224, 
  225. 
  

  

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  T?QiTi£»a 
  Tala-nrl 
  HPrwroc 
  ftfvoifc 
  / 
  7?/j/?irz3 
  fnT* 
  f) 
  

  

  85 
  

  

  vol. 
  i. 
  p. 
  434 
  ; 
  

  

  Hab. 
  Raines 
  Island, 
  Torres 
  Straits 
  (Beeve, 
  for 
  C. 
  rostratus 
  and 
  

   C. 
  striatus), 
  Port 
  Lincoln 
  (J. 
  B. 
  Harvey), 
  Newcastle 
  {Dr. 
  Dieffen- 
  

   bach), 
  Port 
  Jackson 
  {Coppinger, 
  Richardson, 
  Juhes, 
  King) 
  — 
  all 
  in 
  

   Brit. 
  Mus. 
  ; 
  Hinders 
  Island 
  (./. 
  MilJigan) 
  ; 
  Tasmania 
  {Reeve, 
  

   C. 
  gunnii) 
  ; 
  Tasmania 
  {Mucgillivray 
  and 
  Gunn, 
  in 
  Brit. 
  Mus.). 
  

  

  The 
  variety 
  gunnii, 
  from 
  South 
  Australia 
  and 
  Tasmania, 
  may 
  be 
  

   recognized 
  by 
  the 
  valves 
  being 
  narrower, 
  with 
  the 
  exception 
  of 
  the 
  

   first 
  two. 
  This 
  form 
  also 
  appears 
  to 
  attain 
  a 
  larger 
  size 
  than 
  speci- 
  

   mens 
  from 
  New 
  South 
  Wales 
  and 
  other 
  localities 
  further 
  north. 
  A 
  

   specimen 
  in 
  spirit, 
  from 
  the 
  mouth 
  of 
  the 
  river 
  Tamar, 
  Tasmania, 
  

   presented 
  to 
  the 
  British 
  Museiim 
  by 
  J. 
  Macgillivray, 
  exceeds 
  four 
  

   inches 
  in 
  length. 
  The 
  mantle 
  of 
  the 
  southern 
  form 
  also 
  appears 
  to 
  

   be 
  rather 
  less 
  densely 
  covered 
  with 
  the 
  minute 
  conical 
  spines. 
  The 
  

   number 
  of 
  gills 
  on 
  each 
  side 
  varies 
  with 
  age, 
  and 
  even 
  in 
  individual 
  

   specimens 
  : 
  I 
  have 
  found 
  30 
  or 
  31 
  on 
  each 
  side 
  in 
  specimens 
  of 
  

   equal 
  size 
  from 
  both 
  regions 
  — 
  that 
  is, 
  north 
  and 
  south 
  ; 
  and 
  in 
  the 
  

   largest 
  specimen 
  before 
  referred 
  to 
  there 
  are 
  37 
  on 
  the 
  right 
  side 
  

   and 
  34 
  on 
  the 
  left, 
  and 
  there 
  is 
  no 
  appearance 
  of 
  any 
  having 
  been 
  

   removed. 
  The 
  plates 
  of 
  insertion 
  offer 
  no 
  distinctions, 
  each 
  having 
  

   three 
  slits 
  in 
  the 
  front 
  valve 
  and 
  none 
  in 
  the 
  rest, 
  as 
  is 
  the 
  case 
  in 
  

   all 
  Chitonelli. 
  The 
  colour 
  both 
  of 
  the 
  valves 
  and 
  mantle 
  seems 
  to 
  

   agree 
  very 
  closely 
  in 
  all 
  the 
  varieties, 
  The 
  0. 
  rostratus 
  of 
  Reeve 
  

   I 
  cannot 
  in 
  any 
  way 
  distinguish 
  from 
  the 
  shells 
  figured 
  by 
  him 
  as 
  

   Lamarck's 
  C. 
  striatus, 
  and 
  the 
  same 
  observation 
  also 
  applies 
  to 
  his 
  

   notion 
  of 
  Quoy's 
  0. 
  oculatus. 
  What 
  the 
  latter 
  may 
  in 
  reality 
  be 
  is 
  

   an 
  uncertainty 
  to 
  me 
  at 
  present, 
  for 
  I 
  cannot 
  identify 
  any 
  specimen 
  

   in 
  the 
  British 
  Museum 
  with 
  it. 
  

  

  119. 
  CMton 
  (Chitonellus) 
  burrowi. 
  

  

  Chitonellus 
  larvseformis, 
  Reeve 
  {non 
  Burrmv), 
  Conch. 
  Icon. 
  fig. 
  3. 
  

  

  Hab. 
  Port 
  Molle 
  {Coppinger) 
  ; 
  Port 
  Adelaide 
  {Reeve). 
  

  

  This 
  curious 
  species 
  is 
  known 
  by 
  the 
  small 
  size 
  of 
  the 
  valves, 
  the 
  

   remoteness 
  from 
  one 
  another 
  of 
  the 
  fourth, 
  fifth, 
  and 
  sixth, 
  and 
  the 
  

   excessively 
  short 
  and 
  densely 
  packed 
  spines 
  on 
  the 
  mantle. 
  The 
  

   single 
  specimen 
  in 
  spirit, 
  from 
  Port 
  Molle, 
  is 
  of 
  a 
  buff 
  colour, 
  

   copiously 
  mottled 
  with 
  green 
  : 
  this 
  accords 
  with 
  a 
  specimen 
  (also 
  

   in 
  spirit) 
  mentioned 
  by 
  Reeve, 
  collected 
  by 
  Capt. 
  Belcher 
  in 
  the 
  

   Straits 
  of 
  Macassar. 
  

  

  The 
  dried 
  specimens 
  are 
  greyish, 
  more 
  or 
  less 
  rose-tinted. 
  

  

  The 
  sculpture 
  of 
  the 
  valves 
  is 
  very 
  like 
  that 
  of 
  0. 
  striatus, 
  consist- 
  

   ing 
  of 
  a 
  central 
  smoothish 
  ridge, 
  with 
  two 
  or 
  three 
  finer 
  and 
  more 
  

   or 
  less 
  wrinkled 
  ones 
  on 
  each 
  side, 
  the 
  front 
  valve 
  of 
  course 
  being 
  

   wrinkled 
  throughout 
  and 
  lacking 
  the 
  central 
  smooth 
  ridge. 
  They 
  

   are 
  yellowish 
  at 
  the 
  mucro 
  or 
  posteriorly, 
  and 
  pinkish 
  red 
  in 
  front. 
  

   The 
  plates 
  of 
  insertion 
  are 
  like 
  those 
  of 
  C. 
  striatus, 
  and 
  of 
  a 
  pale 
  

   greenish 
  colour. 
  

  

  