﻿128 
  Dr. 
  J. 
  C. 
  Melvill 
  and 
  Mr. 
  E. 
  Staiulen 
  on 
  

  

  Suborder 
  A 
  R 
  C 
  A 
  c 
  e 
  A. 
  

  

  Fam, 
  Arcadse. 
  

  

  Limopsis 
  hardingii, 
  sp. 
  n. 
  (PI. 
  VII. 
  figs. 
  2, 
  2 
  a.) 
  

  

  L. 
  testa 
  crassiuscula, 
  albida, 
  nitida, 
  obliquante, 
  superficie 
  undique 
  

   concentrice 
  irregulariter 
  striata, 
  versus 
  marginera 
  ventralem 
  

   loiigitudinaliter 
  radiatim 
  multistrigata, 
  aliter 
  Icevi, 
  iimbonibus 
  

   parvis, 
  acurainatis, 
  pagina 
  intus 
  alba, 
  Itevi, 
  margine 
  simpliciter 
  

   planato, 
  cardine 
  regulari, 
  dentibus 
  ad 
  10 
  utrinque 
  iustriictis, 
  

   linea 
  palliali 
  baud 
  siiuiosa. 
  

  

  Alt. 
  2G, 
  lat. 
  2S, 
  diam. 
  9 
  mm. 
  

  

  Roy 
  Cove. 
  

  

  Compared 
  with 
  tlie 
  known 
  species 
  of 
  the 
  genus, 
  this 
  comes, 
  

   perhaps, 
  nearest 
  to 
  L. 
  pelagica, 
  Smith, 
  than 
  wliich 
  it 
  is 
  far 
  

   less 
  oblique, 
  larger, 
  and 
  more 
  substantial. 
  L. 
  grandls 
  and 
  

   marionensis, 
  both 
  also 
  of 
  Smith 
  and 
  from 
  southern 
  latitudes, 
  

   are 
  comparable 
  in 
  a 
  lesser 
  degree. 
  Our 
  only 
  example 
  was 
  

   found 
  denuded 
  of 
  its 
  periostracum. 
  We 
  have 
  been 
  requested 
  

   by 
  Mr. 
  Vallentin 
  to 
  associate 
  with 
  this 
  fine 
  Limopsis, 
  of 
  

   which 
  we 
  hope 
  better 
  examples 
  will 
  some 
  day 
  be 
  brought 
  to 
  

   light, 
  the 
  name 
  of 
  Mr. 
  W. 
  H. 
  Harding', 
  Colonial 
  Manager 
  of 
  

   the 
  Falkland 
  Isles 
  Company, 
  who 
  has 
  rendered 
  much 
  service 
  

   in 
  local 
  biological 
  investigation. 
  

  

  Subfam. 
  PiriLOBRTiy^. 
  

   Philohrya 
  sp. 
  

  

  Roy 
  CJove. 
  

  

  Immature, 
  and 
  only 
  serving 
  to 
  demonstrate 
  the 
  presence 
  

   of 
  this 
  genus 
  in 
  the 
  VV. 
  Falklands. 
  

  

  Suborder 
  M 
  Y 
  T 
  I 
  L 
  A 
  C 
  E 
  A. 
  

  

  Fam. 
  Mytilidae. 
  

  

  MytUus 
  hifurcatus, 
  Conr. 
  

  

  Mytilus 
  bifurcatus, 
  Courad, 
  Journ. 
  Amer, 
  Nat. 
  Sci. 
  Phil. 
  v. 
  7, 
  pi. 
  ccxli. 
  

  

  Roy 
  Cove. 
  

  

  MytUus 
  eduh'sj 
  L. 
  

  

  Miftilus 
  edulis, 
  Linne, 
  Syst. 
  Nat. 
  xii. 
  ed. 
  p. 
  1157 
  (1769) 
  ; 
  Forbes 
  & 
  

   Haiilev, 
  ii. 
  p. 
  170, 
  pi. 
  xlviii. 
  figs. 
  1-4; 
  Jeftrevs, 
  Hist. 
  Concli. 
  ii. 
  

   p. 
  104 
  (1863); 
  Suiith, 
  Phil. 
  Trans. 
  Royal 
  Soc. 
  Lond. 
  clxyiii. 
  p. 
  189 
  

   (1879). 
  

  

  Common, 
  and, 
  as 
  in 
  case 
  of 
  Anomia 
  epldppium^ 
  found 
  both 
  

   in 
  the 
  north 
  and 
  south 
  polar 
  areas. 
  

  

  