﻿HO 
  Dr. 
  J. 
  C. 
  Melvill 
  and 
  Mr. 
  R. 
  Standen 
  on 
  

  

  anterior 
  outline 
  is 
  liigli, 
  and 
  an 
  excavation 
  exists 
  below 
  it. 
  

   The 
  posterior 
  outline 
  has 
  a 
  deep 
  dimple, 
  the 
  inferior 
  margin 
  

   of 
  the 
  base 
  is 
  convex, 
  and 
  the 
  prow 
  rounded. 
  The 
  posterior 
  

   hooks 
  have 
  the 
  same 
  structure, 
  but 
  are 
  smaller, 
  and 
  the 
  

   hispid 
  crowns 
  are 
  proportionally 
  large. 
  After 
  the 
  cessation 
  

   of 
  the 
  bristles 
  the 
  uncinigerous 
  processes 
  become 
  more 
  

   distinct, 
  and 
  posteriorly 
  they 
  form 
  in 
  front 
  of 
  the 
  tail 
  a 
  

   conspicuous 
  series 
  of 
  serrations. 
  

  

  The 
  tube 
  is 
  of 
  moderate 
  length, 
  and 
  composed 
  of 
  secretion 
  

   strengthened 
  by 
  glittering 
  sponge-spicules 
  and 
  minute 
  

   Foraminifera, 
  so 
  that 
  it 
  forms 
  a 
  somewhat 
  thick 
  rough 
  

   or 
  hirsute 
  tunnel. 
  They 
  seem 
  to 
  have 
  formed 
  groups. 
  

   The 
  sponge-spicules 
  constitute 
  a 
  large 
  part 
  of 
  the 
  wall 
  of 
  

   the 
  tube, 
  and 
  form 
  a 
  very 
  efficient 
  protection. 
  The 
  inner 
  

   secretion 
  is 
  somewhat 
  tough. 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATES 
  *. 
  

   Plate 
  V. 
  

  

  A 
  female 
  lesser 
  rorqual 
  on 
  its 
  right 
  side. 
  It 
  had 
  been 
  dead 
  several 
  weelis. 
  

  

  Plate 
  VI. 
  

  

  Fig. 
  1. 
  Anterior 
  region 
  of 
  Prionospio, 
  from 
  the 
  Gulf 
  of 
  St. 
  Lawrence, 
  

   Canada 
  (dredged 
  by 
  Dr. 
  Whiteaves). 
  The 
  long 
  tentacles, 
  no 
  

   trace 
  of 
  which 
  occurred 
  in 
  the 
  collection, 
  have 
  been 
  added 
  from 
  

   Sars. 
  Enlarged 
  under 
  a 
  low 
  power. 
  

  

  Ficj. 
  2. 
  First 
  foot 
  of 
  the 
  foregoing. 
  Zeiss, 
  oc. 
  4, 
  obj. 
  A. 
  

  

  Ftg. 
  ?>. 
  Second 
  foot 
  of 
  the 
  same. 
  Ditto. 
  

  

  Ftff. 
  4. 
  Anteiior 
  foot 
  with 
  dorsal 
  and 
  ventral 
  laniellje 
  and, 
  to 
  the 
  right, 
  

   a 
  branchia. 
  Similarly 
  magnitied. 
  

  

  Fig. 
  5. 
  Dorsal 
  bristle, 
  witli 
  its 
  marked 
  curvature. 
  X 
  00. 
  4, 
  obj. 
  D. 
  

  

  Fig. 
  6. 
  Portion 
  of 
  the 
  shaft 
  of 
  another 
  example, 
  presenting 
  the 
  transverse 
  

   granular 
  bars. 
  X 
  oc. 
  4, 
  obj. 
  D. 
  

  

  Fig. 
  7. 
  Stiff 
  curved 
  bristle 
  guarding 
  the 
  ventral 
  hooks 
  inferiorlj 
  in 
  the 
  

   middle 
  of 
  the 
  body. 
  X 
  oc. 
  4, 
  obj. 
  D. 
  

  

  Fig. 
  8. 
  Ventral 
  hook. 
  Similarly 
  magnitied. 
  

  

  XII. 
  — 
  Notes 
  on 
  MoUusca 
  collected 
  in 
  the 
  North-west 
  Falk- 
  

   lands 
  hy 
  Mr. 
  Rupert 
  Vallentin, 
  F.L.S., 
  lu'ith 
  Descriptions 
  

   of 
  Six 
  new 
  Species. 
  By 
  James 
  Cosmo 
  Melvill, 
  M.A., 
  

   D.Sc, 
  F.L.S., 
  and 
  Robert 
  Standen, 
  Assistant 
  Keeper, 
  

   Manchester 
  Museum. 
  

  

  [Plate 
  VII.] 
  

  

  Considerably 
  more 
  than 
  twelve 
  years 
  have 
  elapsed 
  since 
  

   we 
  reported 
  f 
  on 
  a 
  collection 
  of 
  Marine 
  IMollusca 
  found 
  by 
  

   jMr. 
  Rupert 
  Vallentin, 
  F.L.S., 
  in 
  the 
  East 
  Falklands, 
  maiidy 
  

   in 
  the 
  neighbourhood 
  of 
  Port 
  William 
  and 
  Stanley 
  Harbour, 
  

   and 
  we 
  had 
  also, 
  previously 
  to 
  thi.s|, 
  in 
  1898, 
  published 
  an 
  

  

  * 
  I 
  am 
  indebted 
  to 
  the 
  Carnegie 
  Trust 
  for 
  these 
  Plates, 
  

   t 
  Journ. 
  of 
  Conch, 
  x. 
  pp. 
  43-47 
  (1901). 
  

   X 
  Id. 
  ix. 
  pp. 
  97-IO0 
  (1898). 
  

  

  