﻿SPECIES 
  OF 
  CAMPTOCEEAS. 
  219 
  

  

  Gunga 
  river, 
  near 
  Moradabad 
  in 
  Kohilkhund, 
  India. 
  Benson 
  thus 
  

   describes 
  the 
  animal 
  : 
  — 
  

  

  "Animal 
  tentaculis 
  duobus 
  filiformibus, 
  obtusis, 
  oculis 
  magnis 
  

   inter 
  tentacula 
  sitis, 
  proboscideque 
  mediocri 
  munitum 
  ; 
  pallio 
  labia 
  

   testae 
  haud 
  transeunte 
  ; 
  pede 
  brevi, 
  longitudinem 
  aperturse 
  vix 
  

   superante." 
  

  

  " 
  The 
  form 
  of 
  the 
  tentacula 
  and 
  the 
  position 
  of 
  the 
  eyes, 
  situated 
  

   between 
  the 
  filiform 
  tentacula, 
  and 
  sessile 
  on 
  the 
  head 
  (not 
  as 
  in 
  

   Lymncea, 
  occupying 
  the 
  fore 
  part 
  of 
  the 
  widened 
  base 
  of 
  the 
  trian- 
  

   gular 
  tentacula), 
  at 
  once 
  distinguish 
  the 
  animal 
  from 
  that 
  of 
  

   Lymncea. 
  In 
  Camptoceras 
  the 
  eyes 
  are 
  large 
  in 
  proportion 
  to 
  the 
  

   size 
  of 
  the 
  animal, 
  while 
  in 
  Lymncea 
  they 
  present 
  only 
  a 
  minute 
  

   black 
  point, 
  even 
  in 
  individuals 
  of 
  large 
  size." 
  .... 
  " 
  The 
  short- 
  

   ness 
  of 
  the 
  foot, 
  however, 
  the 
  sluggish 
  movements 
  of 
  the 
  mollusk, 
  

   and 
  its 
  strong 
  adhesion 
  to 
  smooth 
  surfaces, 
  point 
  to 
  an 
  affinity 
  with 
  

   Ancylus, 
  which, 
  instead 
  of 
  presenting 
  the 
  elongate, 
  imperfectly 
  

   rolled, 
  acutely 
  spiral 
  cone 
  of 
  Camptoceras, 
  sinks 
  into, 
  a 
  widely- 
  

   spread, 
  depressed 
  cone, 
  with 
  scarcely 
  any 
  distortion 
  of 
  the 
  spire." 
  

   Ancylus 
  is 
  also 
  sinistral. 
  

  

  " 
  The 
  animal 
  adheres, 
  in 
  deep 
  water, 
  to 
  the 
  decaying 
  stems 
  of 
  a 
  

   reedy 
  sedge, 
  more 
  frequently 
  burrowing 
  into 
  them, 
  and 
  concealing 
  

   itself 
  between 
  the 
  internal 
  layers 
  ; 
  a 
  habit 
  which 
  renders 
  it 
  difficult 
  

   to 
  detect." 
  

  

  It 
  occurred 
  with 
  species 
  of 
  Planorbis 
  and 
  Ancylus, 
  was 
  very 
  local, 
  

   and 
  was 
  taken 
  in 
  February 
  1842; 
  but 
  at 
  the 
  end 
  of 
  1845 
  no 
  more 
  could 
  

   be 
  found, 
  and 
  it 
  has 
  never 
  since 
  been 
  found 
  by 
  any 
  collector 
  in 
  

   India. 
  As 
  Benson 
  remarks, 
  it 
  may 
  be 
  more 
  abundant 
  during 
  the 
  

   rainy 
  season 
  in 
  July 
  and 
  August 
  ; 
  but 
  the 
  character 
  of 
  the 
  sur- 
  

   rounding 
  country 
  is 
  not 
  then 
  favourable 
  in 
  point 
  of 
  healthiness 
  or 
  

   practicability 
  for 
  exploration. 
  

  

  In 
  March 
  1869, 
  when 
  encamped 
  near 
  some 
  marshes 
  at 
  Nazirpur, 
  

   near 
  Shushong-Durgapur, 
  in 
  the 
  Mymensing 
  district 
  under 
  the 
  

   Garo 
  hills, 
  and 
  where 
  I 
  often 
  searched 
  for 
  shells, 
  I 
  was 
  so 
  fortunate 
  

   as 
  to 
  discover 
  two 
  other 
  species 
  of 
  Camptoceras 
  living 
  together. 
  The 
  

   water 
  of 
  the 
  " 
  Beels," 
  as 
  marshes 
  are 
  called 
  there, 
  was 
  then 
  fast 
  

   drying 
  up 
  ; 
  and 
  all 
  the 
  specimens 
  that 
  I 
  found 
  were 
  adhering 
  tightly 
  

   to 
  the 
  surface 
  of 
  the 
  dried-up 
  water-plants, 
  a 
  few 
  feet 
  from 
  the 
  

   water's 
  edge*. 
  I 
  had 
  no 
  leisure 
  to 
  watch 
  and 
  examine 
  the 
  animals, 
  

   and 
  on 
  my 
  arrival 
  in 
  Calcutta, 
  a 
  short 
  time 
  afterwards, 
  gave 
  them 
  

   over 
  to 
  Mr. 
  H. 
  F. 
  Blanford, 
  who 
  described 
  and 
  figured 
  them 
  in 
  the 
  

   1 
  Journal 
  of 
  the 
  Asiatic 
  Society 
  of 
  Bengal,' 
  pt. 
  ii. 
  1871, 
  pp. 
  39-41, 
  

   under 
  the 
  names 
  of 
  C. 
  Austeni 
  and 
  C. 
  lineatum, 
  the 
  former, 
  of 
  which 
  

   I 
  give 
  an 
  outline 
  figure 
  (Plate 
  V. 
  fig. 
  9), 
  being 
  nearest 
  to 
  0. 
  terebra. 
  

  

  The 
  fossil 
  species 
  is 
  nearest 
  to 
  C. 
  terebra, 
  Benson, 
  in 
  the 
  form 
  of 
  

   the 
  whorls, 
  but 
  differs 
  considerably 
  in 
  their 
  greater 
  number 
  and 
  more 
  

   elongate 
  form. 
  Unfortunately 
  the 
  aperture 
  has 
  not 
  been 
  preserved 
  

   entire 
  in 
  any 
  of 
  the 
  specimens 
  on 
  the 
  little 
  block 
  I 
  have 
  before 
  me. 
  

   C. 
  lineatum 
  was 
  abundant 
  where 
  I 
  found 
  it 
  ; 
  and 
  the 
  fossil 
  species 
  

  

  * 
  This 
  same 
  ground, 
  a 
  few 
  months 
  after, 
  during 
  the 
  rains, 
  would 
  be 
  10 
  or 
  15 
  

   feet 
  under 
  water. 
  

  

  