﻿Mollusca 
  from 
  the 
  North-west 
  Falklands. 
  127 
  

  

  Class 
  PELECYPODA. 
  

  

  Older 
  PROTOBRANCHIATA. 
  

  

  Famil)'- 
  Nuculidae. 
  

  

  Nucula 
  pisum, 
  Sowb. 
  

  

  Nucula 
  pisum, 
  Sowerby, 
  Thes. 
  Conch, 
  iii. 
  p. 
  153, 
  pi. 
  ccxxix. 
  %. 
  133; 
  

   Trans. 
  Royal 
  Soc. 
  Edinb. 
  xlviii. 
  p. 
  360. 
  

  

  Local, 
  but 
  occasionally 
  plentiful. 
  

  

  This 
  is 
  probably 
  N. 
  semi'ornata, 
  Orbigny. 
  It 
  was 
  originally 
  

   described 
  by 
  Sowerby 
  in 
  P. 
  Z. 
  S. 
  Lond. 
  1832. 
  

  

  Yoldia 
  eightsii 
  (Couth.). 
  

  

  Nucula 
  eightsii, 
  Couthouy, 
  Jay, 
  Cat. 
  Shells, 
  ed. 
  iii. 
  p. 
  113, 
  pi. 
  i. 
  

  

  fi^s. 
  12, 
  13 
  (1830). 
  

   Leda 
  {Yoldia) 
  eightsii, 
  Hanley, 
  in 
  Sowb. 
  Thes. 
  Conch, 
  iii. 
  p. 
  142, 
  

  

  pi. 
  ccxxx. 
  fig. 
  164. 
  

   Yoldia 
  eightsii, 
  Sowerby, 
  Reeve, 
  Conch. 
  Icon. 
  xx. 
  pi. 
  v. 
  fig. 
  26. 
  

  

  Roy 
  Cove, 
  at 
  extreme 
  low- 
  water 
  mark, 
  spring 
  tides. 
  

  

  Yoldia 
  ivoodivardij 
  Planl. 
  

  

  Yoldia 
  ivoodtvardi, 
  Hanley, 
  P. 
  Z. 
  S. 
  Lond. 
  p. 
  370 
  (1860) 
  ; 
  Reeve, 
  

   Conch. 
  Icon, 
  xviii. 
  pi. 
  i. 
  fig. 
  9(1871); 
  Pelseneer, 
  Voy. 
  'Belgica,' 
  

   Moll. 
  p. 
  10 
  (1903) 
  ; 
  Lamy, 
  Moll. 
  Orcades 
  du 
  Sud, 
  Bull. 
  Mns. 
  Hist. 
  

   Nat. 
  xii. 
  p. 
  125 
  (1900) 
  ; 
  Charcot, 
  Exp. 
  Ant. 
  Fran^aise, 
  p. 
  19 
  (1906). 
  

  

  Roy 
  Cove, 
  4-6 
  fathoms 
  (November 
  1909), 
  

   Very 
  perfect 
  examples, 
  three 
  in 
  number. 
  

  

  Order 
  FILIBRANCHIATA. 
  

  

  Suborder 
  A 
  N 
  M 
  i 
  A 
  C 
  E 
  A. 
  

  

  Fara. 
  Anomiidae. 
  

  

  Anemia 
  ephippium, 
  L. 
  

  

  Anomia 
  ephippium, 
  Linn^, 
  SyvSt. 
  Nat. 
  xii. 
  (1769) 
  ; 
  JefTreys, 
  Brit. 
  Conch, 
  

   ii. 
  p. 
  30, 
  pi. 
  i. 
  fig. 
  4 
  ; 
  Smith, 
  Report 
  * 
  Challenger 
  ' 
  Exped., 
  Zool 
  xiii. 
  

   p. 
  318. 
  

  

  Roy 
  Cove. 
  

  

  One 
  of 
  the 
  very 
  few 
  species 
  found 
  to 
  be 
  common 
  to 
  the 
  

   northern 
  and 
  southern 
  polar 
  regions. 
  

  

  