﻿JONES 
  & 
  KENNAUD 
  : 
  NON-MARINE 
  MOLUJSCA 
  OF 
  E. 
  ROSS, 
  ETC. 
  151 
  

  

  The 
  colour 
  forms 
  noted 
  were 
  : 
  arenicola, 
  liitea, 
  cf 
  . 
  fagoriim, 
  and 
  

   a 
  form 
  palm 
  fawn 
  above 
  and 
  much 
  darker 
  beneath. 
  

  

  There 
  was 
  a 
  total 
  absence 
  of 
  the 
  unhanded 
  lutea 
  form 
  so 
  common 
  

   in 
  the 
  south. 
  

  

  CocJdicopa 
  lubrica 
  (Miill.). 
  — 
  The 
  white 
  form 
  of 
  this 
  species 
  occurred 
  

   at 
  Stroma. 
  

  

  Pupilla 
  tmisconim 
  (Linn.). 
  — 
  A 
  single 
  example 
  taken 
  at 
  St. 
  Mary's. 
  

   Hitherto 
  unrecorded 
  from 
  Orkney. 
  

  

  Lauria 
  cylindracea 
  (Da 
  C). 
  — 
  In 
  Orkney 
  this 
  species 
  is 
  widely 
  

   distributed, 
  and 
  was 
  taken 
  comuionly 
  on 
  Mainland 
  in 
  various 
  localities. 
  

   On 
  South. 
  Ronaldshay 
  it 
  was 
  observed 
  at 
  Widewall 
  Bay, 
  Hoxa 
  

   Broch, 
  Sandwick 
  Bay, 
  and 
  Water 
  Sound. 
  

  

  On 
  Flotta 
  it 
  occurred 
  near 
  Neb, 
  on 
  the 
  sea-cliffs 
  near 
  Quoyness, 
  

   and 
  was 
  common 
  on 
  the 
  kirkyard 
  wall. 
  It 
  was 
  common 
  on 
  Burray 
  

   and 
  Stroma. 
  In 
  Shetland 
  it 
  was 
  only 
  taken 
  on 
  a 
  pile 
  of 
  stones 
  

   opposite 
  Voe 
  House 
  at 
  Voe. 
  These 
  examples 
  were 
  a 
  dwarfed 
  form 
  

   with 
  a 
  long 
  body-whorl, 
  the 
  ])eristonie 
  but 
  little 
  developed 
  and 
  

   the 
  tooth 
  absent. 
  Some 
  of 
  the 
  Orkney 
  examples 
  approach 
  this 
  

   form, 
  but 
  tlie 
  East 
  Iloss 
  specimens 
  are 
  normal. 
  

  

  lialea 
  perversa 
  (Linn.). 
  — 
  From 
  Graemeshall 
  Loch 
  on 
  Mainland 
  

   a 
  small 
  stream 
  flows 
  into 
  the 
  sea 
  and 
  near 
  the 
  mouth 
  a 
  low 
  bridge 
  

   carries 
  the 
  road 
  across 
  it. 
  To 
  the 
  east 
  of 
  this 
  an 
  old 
  lichen- 
  

   covered 
  rough 
  wall 
  skirts 
  a 
  large 
  tumulus, 
  and 
  on 
  the 
  wall 
  examples 
  

   of 
  Balea 
  perversa 
  were 
  obtained 
  : 
  at 
  present 
  it 
  is 
  the 
  only 
  known 
  

   locality 
  for 
  the 
  species 
  in 
  Orkney. 
  

  

  Limnoia 
  perec/er 
  (Miill.). 
  — 
  Common 
  in 
  East 
  Iloss. 
  Absent 
  from 
  

   Cava 
  and 
  Flotta, 
  fairly 
  large 
  examples 
  on 
  Stroma 
  and 
  South 
  Ronalds- 
  

   hay, 
  and 
  quite 
  large 
  ones 
  at 
  Loch 
  Kirbister 
  on 
  Mainland. 
  In 
  the 
  

   larger 
  Shetland 
  lochs 
  specimens 
  as 
  a 
  rule 
  were 
  small. 
  In 
  almost 
  

   every 
  trickle 
  of 
  water 
  in 
  Shetland 
  small 
  fragile 
  specimens 
  were 
  found. 
  

  

  Limncea 
  truncaiula 
  (Miill.). 
  — 
  In 
  Shetland 
  and 
  East 
  Ross 
  this 
  species 
  

   occurred 
  sparingly 
  and 
  the 
  examples 
  were 
  small. 
  

  

  In 
  Orkney 
  and 
  on 
  Stroma 
  this 
  species 
  attained 
  a 
  large 
  size, 
  

   115 
  mm. 
  

  

  Theodoxus 
  fiuviatilis 
  (Linn.). 
  — 
  Occurs 
  abundantly 
  in 
  Loch 
  Harray, 
  

   Mainland, 
  Orkney. 
  The 
  examples 
  are 
  much 
  eroded. 
  

  

  The 
  occurrence 
  of 
  the 
  species 
  in 
  Orkney 
  is 
  interesting, 
  since 
  it 
  is 
  

   unknown 
  in 
  Scotland. 
  Is 
  it 
  possible 
  that 
  it 
  is 
  an 
  accidental 
  

   introduction 
  ? 
  

  

  