﻿MOlLtrSCA. 
  99 
  

  

  is 
  partly 
  enclosed 
  when 
  the 
  valves 
  are 
  shut. 
  Cardinal 
  teeth 
  two 
  in 
  

   each 
  valve, 
  those 
  of 
  the 
  right 
  most 
  prominent. 
  Front 
  dorsal 
  margin 
  

   of 
  right 
  valve 
  narrowly 
  grooved 
  just 
  within, 
  simple 
  in 
  the 
  left. 
  

   Corselet 
  linear. 
  Posterior 
  muscular 
  impression 
  rotund-pyriform, 
  

   anterior 
  more 
  elongate. 
  Pallial 
  sinus 
  moderate, 
  extending 
  forward 
  

   beyond 
  the 
  middle 
  of 
  the 
  valve. 
  Length 
  19| 
  millim., 
  height 
  10, 
  

   diam. 
  5. 
  

  

  Hob. 
  Prince 
  of 
  "Wales 
  Channel, 
  9 
  fms. 
  

  

  A 
  very 
  elongate 
  narrow 
  species, 
  recalling 
  to 
  mind 
  certain 
  slender 
  

   forms 
  of 
  the 
  geniis 
  Donax. 
  

  

  25. 
  Tellina 
  semen. 
  

  

  Hanley, 
  Thesaurus, 
  vol. 
  i. 
  p. 
  249, 
  pi. 
  56. 
  fig. 
  8 
  ; 
  (? 
  Sowerby, 
  Conch. 
  

   Icon. 
  vol. 
  xvii. 
  fig. 
  232, 
  bad 
  !). 
  

  

  Hah. 
  Thursday 
  Island, 
  Torres 
  Straits, 
  in 
  5-7 
  fms. 
  

  

  Among 
  the 
  specimens 
  from 
  this 
  locality 
  is 
  one 
  of 
  a 
  purplish-rose 
  

   tint, 
  the 
  rest 
  being 
  white 
  like 
  the 
  type. 
  The 
  hinge 
  of 
  this 
  species 
  

   is 
  composed 
  of 
  two 
  cardinal 
  teeth 
  in 
  the 
  right 
  valve 
  (the 
  posterior 
  

   one 
  larger 
  and 
  bifid, 
  with 
  one 
  lateral 
  tooth 
  on 
  each 
  side 
  aud 
  a 
  gropve 
  

   between 
  it 
  and 
  the 
  margin), 
  and 
  of 
  a 
  single 
  bifid 
  cardinal 
  in 
  the 
  left 
  

   valve 
  with 
  a 
  marginal 
  lateral 
  tooth 
  or 
  prominence 
  on 
  each 
  side. 
  The 
  

   pallial 
  sinus 
  is 
  very 
  large, 
  almost 
  reaching 
  to 
  the 
  anterior 
  scar. 
  

  

  The 
  form 
  of 
  this 
  species 
  is 
  very 
  similar 
  to 
  that 
  of 
  T. 
  obtusalis, 
  

   Deshayes, 
  which 
  is 
  the 
  same 
  as 
  T. 
  malaccana, 
  Sowerby 
  (Con. 
  Icon, 
  

   figs. 
  2Sla 
  and 
  125). 
  The 
  posterior 
  end, 
  however, 
  is 
  not 
  so 
  obtuse 
  

   and 
  the 
  form 
  is 
  not 
  so 
  like 
  that 
  of 
  a 
  Donax, 
  In 
  T. 
  obtusalis 
  the 
  

   concentric 
  striae 
  are 
  rather 
  coarser 
  than 
  in 
  the 
  present 
  species, 
  and 
  

   become 
  very 
  much 
  finer 
  anteriorly, 
  so 
  that 
  in 
  that 
  part 
  the 
  shell 
  is 
  

   more 
  glossy 
  and 
  comparatively 
  smooth, 
  which 
  is 
  not 
  the 
  case 
  in 
  

   T. 
  semen. 
  Another 
  form, 
  T. 
  semitecta, 
  Sowerby, 
  from 
  New 
  South 
  

   Wales, 
  is 
  very 
  closely 
  related 
  to 
  the 
  present 
  species, 
  and 
  is 
  mainly 
  

   distinguished 
  by 
  its 
  rather 
  more 
  elongate 
  form, 
  and 
  finer 
  aud 
  less 
  

   elevated 
  sculpture 
  at 
  the 
  hinder 
  extremity. 
  

  

  26. 
  Syndosmya 
  elliptica. 
  (Plate 
  VII. 
  figs. 
  C, 
  C 
  1.) 
  

   Tellina 
  elliptica, 
  Soioerhy, 
  Conch. 
  Icon. 
  fig. 
  223 
  (bad!). 
  

  

  Hub. 
  Port 
  Jackson 
  (Angas 
  and 
  Coppinger). 
  

  

  The 
  type 
  and 
  a 
  second 
  specimen 
  of 
  this 
  sjiecies 
  were 
  presented 
  to 
  

   the 
  British 
  Museum 
  by 
  Mr. 
  Angas 
  in 
  1871. 
  Neither 
  of 
  these 
  nor 
  a 
  

   third 
  collected 
  by 
  Dr. 
  Coppinger 
  exhibit 
  the 
  sinuation 
  at 
  the 
  pos- 
  

   terior 
  end 
  of 
  the 
  ventral 
  margin 
  depicted 
  in 
  Sowerby's 
  figure. 
  His 
  

   words 
  " 
  concentrically 
  ridged 
  behind 
  the 
  angle 
  " 
  are 
  scarcely 
  appli- 
  

   cable, 
  for 
  in 
  the 
  first 
  place 
  there 
  is 
  only 
  the 
  feeblest 
  indication 
  of 
  an 
  

   angle 
  and 
  the 
  sculpture 
  behind 
  it 
  consists 
  of 
  mere 
  concentric 
  stria- 
  

   tion. 
  The 
  hinge-characters 
  show 
  this 
  species 
  to 
  belong 
  to 
  the 
  genus 
  

   tSynclosmya, 
  and 
  Tellina 
  simplex 
  of 
  the 
  same 
  author 
  (Conch. 
  Icon, 
  

   sp. 
  240) 
  requires 
  a 
  similar 
  location. 
  The 
  hinge 
  of 
  the 
  present 
  species 
  

   consists 
  of 
  two 
  cardinal 
  teeth 
  in 
  the 
  right 
  valve, 
  the 
  posterior 
  larger 
  

  

  h2 
  

  

  