﻿JONES 
  & 
  KENNAKD 
  : 
  NON-MARINE 
  MOLLTJSCA 
  OF 
  E. 
  KOSS, 
  ETC. 
  147 
  

  

  Pisidium 
  caserlamim 
  (Poli), 
  Invergorden. 
  

  

  — 
  personatum, 
  Mulm, 
  Invergordon. 
  

  

  — 
  ohtusale, 
  Jenyns, 
  Invergordon. 
  

  

  The 
  Orkneys. 
  

  

  In 
  the 
  Orkneys 
  collecting 
  was 
  confined 
  to 
  some 
  of 
  the 
  southern 
  

   islands. 
  Mainland 
  or 
  Pomona, 
  the 
  largest 
  island 
  of 
  the 
  group, 
  was 
  

   visited 
  at 
  various 
  points 
  of 
  its 
  southern 
  coast, 
  but 
  only 
  a 
  few 
  of 
  

   its 
  many 
  lochs 
  could 
  be 
  examined. 
  Flotta 
  was 
  well 
  explored, 
  while 
  

   Hoy, 
  South 
  Eonaldshay, 
  and 
  South 
  Walls 
  were 
  visited 
  on 
  several 
  

   occasions. 
  Switha 
  and 
  Eurray 
  were 
  visited 
  once 
  and 
  Stroma 
  twice. 
  

   This 
  last 
  is 
  fairly 
  close 
  to 
  the 
  mainland 
  of 
  Scotland, 
  and 
  is 
  separated 
  

   by 
  the 
  larger 
  part 
  of 
  the 
  Pentland 
  Firth 
  from 
  the 
  other 
  islands 
  above 
  

   mentioned. 
  Politically, 
  Stroma 
  is 
  a 
  part 
  of 
  Caithness, 
  and 
  perhaps 
  

   zoologically 
  it 
  may 
  be 
  similarly 
  placed, 
  for 
  a 
  frog 
  (Rana 
  temporaria) 
  

   was 
  seen, 
  and 
  this 
  animal 
  is 
  not 
  known 
  to 
  occur 
  in 
  the 
  Orkneys 
  

   proper. 
  

  

  The 
  Orkneys 
  are 
  for 
  the 
  most 
  part 
  rounded 
  and 
  low-lying, 
  largely 
  

   well 
  cultivated, 
  j'et 
  with 
  considerable 
  areas 
  of 
  rough 
  moorland. 
  The 
  

   hills 
  on 
  Hoy 
  rise 
  to 
  over 
  1,500 
  feet 
  and 
  on 
  Mainland 
  to 
  between 
  800 
  

   and 
  900 
  feet. 
  A 
  feature 
  of 
  the 
  landscape 
  in 
  some 
  parts 
  is 
  the 
  

   number 
  of 
  mill 
  dams, 
  and 
  these 
  harboured 
  great 
  numbers 
  of 
  verv 
  

   large 
  Limnaa 
  tnincatiila. 
  On 
  Mainland, 
  Loch 
  Kirbister 
  is 
  of 
  con- 
  

   siderable 
  size, 
  situate 
  close 
  to 
  the 
  southern 
  coast 
  of 
  the 
  island, 
  with 
  

   a 
  good 
  deal 
  of 
  sand 
  and 
  miul 
  on 
  its 
  bottom 
  and 
  in 
  summer 
  greatlj' 
  

   overgrown 
  with 
  aquatic 
  vegetation. 
  Loch 
  Harray 
  is 
  larger 
  than 
  

   Loch 
  Kirbister, 
  and 
  is 
  in 
  close 
  connexion 
  with 
  the 
  brackish 
  Loch 
  

   Stennes. 
  

  

  Further 
  to 
  the 
  east 
  is 
  Loch 
  Grsemeshall, 
  a 
  piece 
  of 
  shallow 
  water 
  

   of 
  moderate 
  extent 
  with 
  a 
  sandy 
  bottom 
  much 
  overgrown 
  with 
  reeds 
  

   in 
  many 
  places. 
  In 
  this 
  loch 
  Pisidia 
  were 
  exceptionally 
  abundant. 
  

  

  On 
  South 
  lionaldshay 
  tiiere 
  are 
  several 
  small 
  lochs, 
  which 
  are, 
  

   however, 
  conchologically 
  disappointing, 
  since 
  their 
  bottoms 
  of 
  hard 
  

   boulder-clay 
  do 
  not 
  appear 
  to 
  suit 
  the 
  freshwater 
  mollusca. 
  

  

  Echna 
  Loch 
  on 
  Burray 
  was 
  visited 
  once, 
  but 
  only 
  a 
  few 
  examples 
  

   of 
  Planorbis 
  crista 
  were 
  obtained. 
  The 
  majority 
  of 
  the 
  terrestrial 
  

   mollusca 
  were 
  found 
  in 
  the 
  stone 
  heaps 
  or 
  on 
  walls 
  in 
  the 
  cultivated 
  

   parts 
  of 
  the 
  island, 
  but 
  several 
  interesting 
  species, 
  notably 
  Helix 
  

   hortensis, 
  occur 
  chiefly 
  if 
  not 
  entirely 
  on 
  the 
  sea 
  cliffs. 
  

  

  The 
  species 
  obtained 
  were 
  : 
  — 
  

  

  Limax 
  arhorum, 
  Eouch. 
  -Chant., 
  S.R., 
  St., 
  F. 
  

  

  Jgriolimax 
  aqrestis 
  (Linn.), 
  S.H., 
  St., 
  H., 
  F., 
  C, 
  Sw., 
  M. 
  

  

  — 
  Icevis 
  {li^W.), 
  S.li., 
  F., 
  M. 
  

  

  Vitrina 
  pellucida 
  (MiiU.), 
  S.R., 
  St., 
  F., 
  Sw., 
  M. 
  

   Vitrea 
  crystalUna 
  (MiilL), 
  S.R., 
  B., 
  M., 
  Houton. 
  

   PolUa 
  ceilaria 
  (MiilL), 
  S.R., 
  F., 
  M., 
  Holm, 
  St. 
  Mary's. 
  

  

  — 
  alliaria 
  (Mill.), 
  S.R., 
  St., 
  F., 
  C, 
  B., 
  Sw., 
  M., 
  Holm, 
  

   Honton, 
  St. 
  Merv's. 
  

  

  — 
  nifidula 
  (Drap.), 
  'S.H., 
  F., 
  M., 
  Honton. 
  

  

  